Microwave How-To and Troubleshooting Guide

A microwave is crucial kitchen appliance especially if you like to meal prep your meals or refrigerate or freeze your leftovers. It also makes it easy to thaw meat, cook veggies in record time. And in some cases, it comes in handy when you are craving a simple dessert. But what happens when it starts to malfunction and it fails to work as it should. Keep reading to learn how to troubleshoot any issues and how to fix them.

What would cause a microwave to stop working?

Open and close the door, then start the cycle.

Ever had your microwave died abruptly in the middle of microwaving your food? Below are some reasons why that happened.

Blown Fuse

The most common cause for a microwave oven not working at all is a blown main fuse. The microwave main fuse will cut the flow of electricity if too much current passes through it. When this happens, the fuse is considered “blown” and the fuse will need to be replaced with a new one before the microwave will start working again. The main fuse is not the only fuse found in microwave ovens. There can also be thermal fuses, cavity fuses, and thermal protectors which will interrupt the electrical flow if the microwave overheats. All of these parts can be tested with a multimeter to confirm continuity – a continuous electrical path present in the component:

• Before you begin testing, unplug the microwave oven power cord.
• Remove the fuse or thermoprotector from the appliance.
• Rotate the multimeter dial to the lowest setting for “Ohms of resistance”.
• Touch the black lead to one of the component’s terminals and the red lead to the other terminal.
• If the meter display shows zero Ohms of resistance, the component has electrical continuity; if the meter display shows no significant change, the component lacks continuity which means it has blown and will need to be replaced.
• Keep in mind that a blown fuse is often caused by a faulty door switch.

Note: High voltage capacitors used in microwaves may retain a charge even after the power cord has been unplugged, it is recommended to discharge the capacitor before servicing. You can do this by placing a screwdriver blade across each set of capacitor terminals (avoid touching the blade when doing this).

Faulty Door Switch

Most microwaves have three or four-door switches that allow the appliance to start or heat once the door is fully closed. A faulty door switch will prevent the microwave from working even after the door has been closed. You can test each door switch for continuity to determine if one has failed:

Two-terminal door switches will either have continuity before the switch is actuated or after; three-terminal door switches will have a “common” terminal, a “normally closed” terminal that provides continuity before the switch is actuated, and a “normally open” terminal that provides continuity after the switch is actuated.

• For two-terminal switches, touch the black lead to one terminal and the red lead to the other terminal, then actuate the switch. If the meter display shows zero Ohms of resistance, the switch has continuity; if the meter display shows no significant change, the switch has no continuity and is faulty.
• For three-terminal switches, touch the black lead to the “common” terminal and the red lead to the “normally closed” terminal. The multimeter display should show zero Ohms of resistance. Move the red lead to the “normally open” terminal and the multimeter should indicate continuity only after the switch has been actuated.

Note: Be aware, if either a two-terminal or three-terminal door switch tests positive for continuity when it should not, it is likely the switch has shorted closed.

Faulty main control board

Although it’s not a common cause, a defective main control board could prevent the microwave from working as well. Since it’s difficult to test a control board accurately, you should confirm that the fuses, thermoprotector, and door switches all have electrical continuity and are functioning normally before you consider replacing the board.

Because of the high voltage and high current used by microwave ovens, be aware that repairing this appliance poses a substantial risk for injury or death if precautions are not taken. You should always unplug the microwave before you attempt any disassembly.  Since high voltage capacitors used in microwaves may retain a charge even after the microwave has been unplugged, we recommend that only experienced professionals access and replace internal components.

Check this too: Backup Generator 101: Safe Set Up, How to & Troubleshooting

What Are the Symptoms of a Bad Magnetron in a Microwave?

Smoke, sparks, and burning smells.

These are signs of a serious and urgent problem. Stop what you’re doing, and turn off and unplug the microwave immediately. There’s no going back if you see smoke or sparks, or smell something burning. Your microwave is failing, and it’s time for a replacement.

Food isn’t heating properly

Part of the appeal of microwaves is that they seriously speed up cook time. If your microwave is heating food much slower than normal, or not at all, something is off.

If you think your microwave’s power is starting to wane, give it a test. Cook one cup of water on high power for two minutes. If it’s not piping hot, it may be time to consider a new microwave.

It makes horrible sounds as it cooks.

As it cooks, your microwave should be relatively quiet, making no more than a gentle hum. If instead it becomes loud and makes grinding, buzzing, or rattling noises, something is amiss. First, check the turntable and fan blades. A leftover piece of food or misalignment is an easy fix. But if those areas check out okay, there’s a bigger problem at hand that might be best resolved with a new microwave

Microwave Not Heating Food but Turns on/ Runs

Here are a few quick items to check when your microwave isn’t heating your food up.

Check the Microwave Door Switch

The Microwave Door Switch is a piece in the microwave to stop the oven from running while the door is open. If this switch is damaged, the microwave may look like it still works with the fan and rotation motor still functioning, but the food won’t warm up. You won’t realize this until you nuked something 2 or 3 times without any luck.

Check the Microwave Diode

If the microwave is running but not heating your food, another possibility is the diode has burnt out. A diode allows the electrical current to flow in only one direction. If the diode fails, it could mean there is a short, which will allow the current to flow in both directions, or they only part way in one direction.

Note: Always use caution and unplug the microwave and the capacitor before attempting to repair it.

The Heating Element is Burned Out

A microwave that doesn’t heat may also have a broken magnetron. The magnetron is responsible for heat production within the appliance, and a malfunctioning magnetron could blow a fuse, ultimately causing other functions of the microwave to fail.

If you choose to test the magnetron yourself, proceed with caution. Unplug the microwave, remove the cabinet and discharge the high voltage capacitor to protect yourself from electric shock. But to avoid any mishaps, it’s best to leave it up to the professionals.

Blown Thermal Fuse / Thermal Protector

As with any heating appliance, microwaves have overheating protection. Generally in the form of fuses. Once blown, these need to be replaced entirely. While this is fairly simple, the fuses themselves are not nearly as common as the fuses in your home fuse box. You’ll need to get the specific parts from a manufacturer.

Note: The magnetron is a critical feature of the microwave heating function. Unfortunately, if the magnetron has burnt out, it can mean an expensive repair. If the magnetron is not drawing energy, it also means the high voltage capacitor could remain charged for a long time, which makes the microwave especially dangerous.

How to Activate Your Microwave’s Silent Mode

Look for a button with a sound or speaker icon, or one that simply says “sound.” It sounds almost too obvious, but some models made the job that easy.

Alternatively, try holding down the 0 buttons, the 1 button, or the button that says “stop.” These buttons often have secret functions programmed by the manufacturers to help you turn off your microwave’s beeps.

Note: Not all microwaves have the silencing feature. The mode of activation may vary with different microwave brands. For further clarification on how to silence your microwave, refer to your user manual.

Microwave Door Won’t Close

Do the following if the microwave door is not closing;

Check for Debris

Before looking into what repair you need to make, you need to make sure you actually need a repair. Overuse, especially if you don’t clean your microwave often, food particles and grease can build up in your microwave. If your door won’t close, you want to make sure there is no obstruction in the parts that need to close.

Check around the hinges, the door, and the part of the cabinet where the door meets the appliance. You may also want to look at the door latch and the assembly just in case something got pushed into those areas while cleaning.

Damaged Hinges

While other causes are more likely, you may want to check the hinges for damage. If the hinges are loose, damaged, or rusty, they may prevent the microwave door from closing in the exact position that it needs to.

Typically, you will be able to see the damage that prevents the door from closing or you may notice a wobble when you move the microwave door. Luckily, microwave door hinges are quite easy to replace.

Broken Torsion Springs

If the door on your microwave oven doesn’t appear to close properly, you may have a broken torsion spring. On microwaves that have a door that opens downward, torsion springs are used to keep it closed. There are normally left and right side springs and they are often different sizes.

If your door won’t stay closed, one of the springs may have broken. Unplug the unit and remove the inner and outer door panels to access the torsion springs that are located at the bottom front of the door. Depending on the model involved, the panels may be held in place with screws from the inside, bottom, or sides. Use caution as the outer glass door may be heavy.

Door Latch Assembly

If your microwave door won’t close or the latch isn’t engaging, it is most likely a problem with the door latch assembly. In most microwaves, the door will have a latch or two that enters an alcove on the cabinet and activates a switch. Once this switch is met with the door hook, it will allow the microwave to receive power.

The latch assembly is normally made of plastic and usually has a spring attached to provide downward tension to keep the hooks engaged. If either of the hooks is broken or does not have any spring tension, you may need to replace the assembly.

Microwave Not Rotating

Microwave plates stop spinning for one of four reasons, depending on what your microwave has been through. We’ll help you hunt down your reason starting with those easiest to fix.

Obstructions in the Track

The first and easiest cause to fix is a track obstruction. The roller guide and coupler spin in a track below your microwave plate. If crumbs, spills, or other obstructions get in the way of their circular journey, your turntable may stop spinning or experience a bumpy stop-start spin that does not cook the food evenly.

Remove the microwave plate and examine the roller and coupler below. Test how they each spin independently, and if there are any visible food remnants in the way of the spin. Crumbs and sticky spills are the most likely to be a problem.

Solution;

Thoroughly scrub the inside of your microwave, paying special attention to the roller track and the area around the coupler. Scrub around the coupler to get rid of any sticky residue. Do not soak the coupler, as there are electrical components beneath it.

Dirty or Damaged Roller Guide

The roller guide is a circular or vaguely triangular object with small wheels that the plate rests on. The wheels must be able to roll smoothly in the track for the plate to turn. Just as obstructions in the track can stop the rotation, so can broken wheels.

If the wheels of your roller guide are broken or have become especially dirty, then your plate may have stopped spinning. A broken roller arm can also be a cause of unbalanced and rotation-stopping forces.

Remove the microwave plate and the roller guide below. Closely examine the roller guide for signs of grime or damage. Consider if it is dirty, sticky, or if it has been broken in any way.

Solution;

If it is dirty, wipe down the roller guide with a warm soapy sponge. If it is sticky, soak it in warm water for a few minutes first, then wipe it down. If the roller guide is broken, you’ll need to purchase a new one. Fortunately, the installation isn’t difficult.

Damaged Tray Coupler

The tray coupler is the grooved piece in the center that spins on a motor. This is what conveys the turntable force to your microwave plate. The bottom of the plate and the top of the coupler must fit perfectly for the force to be conveyed correctly.

If the plate resists too much because the force is unbalanced, then the coupler will stop trying to spin. If the coupler is broken or ‘stripped’ (like the top of a screw), then it may not be conveying force correctly.

Remove your microwave plate. Take a close look at the tray coupler in the center of the microwave floor. Determine if the coupler looks damaged, melted, dirty, or if the grooves have stripped out over time. Test by setting the plate on top and wiggling it.

Solution

If the coupler is dirty, it can be cleaned. But all other problems will need to be solved by installing a new coupler that will fit properly with your microwave plate.

Broken Turntable Motor

If your microwave is clean, the guide is fine, and the coupler is firmly seated then the only final option is the turntable motor. This is the piece located beneath the coupler that provides the spinning force. Motors are electrical moving parts and they do wear out over time.

Needing to replace your microwave motor is a very common repair. When a motor fails normally, it will fade and sputter out. However, your microwave motor can go out suddenly if something burnt it out.

When the motor burns out, your microwave spin will slow down, become unreliable, and fade over time. Or you may notice an event of spin resistance that directly damaged the motor. If you are confident with appliances and multimeter, you can check the turntable motor’s current.

Solution:

Use a multimeter for continuity;

• Open the microwave door and remove the glass tray and support ring.
• Use a screwdriver to remove the screws from the back side of the microwave.
• Disconnect the wire harness by squeezing the plug and then set the lower panel aside.
• Now Use a screwdriver to pop the terminals off the turntable motor wires.
• Connect the terminals of the motor with the terminals of the multimeter and check for continuity.
• If there is no continuity, then you may need to get the motor replaced. 
• However if it does have continuity, then it may be due to some other reason.

Solution

You will need to replace your turntable motor. If you don’t have a multimeter but the other three options weren’t your problem, then there’s a good chance that the problem is your turntable motor. The turntable motor is underneath the coupler at the center of the microwave’s floor.

How to Properly Clean Your Microwave

It goes without saying that you should always clean up your oven when it gets messy. However different messes may require different cleaning approaches. Especially when food splatter in the microwave. Keep reading to learn how to best clean your microwave.

Items needed

• 1 cup of water
• Sponge
• Lemon
• White vinegar
• Baking soda
• Dish soap
• Commercial cleaner
• Microfibre cloths
• Microwave safe bowl
• Cleaning your microwave

How to clean a microwave

Wet Paper Towel Method

Place the wet paper towels inside your microwave and run your microwave on high for around 5 minutes. This trick will create steam which will help you remove unwanted dirt and contaminants in your microwave. It also serves as a primer for tougher issues like stuck food.

Using dish soap

This method works almost the same as the Wet Paper Towel Method. Fill a non-metallic microwave-safe bowl with parts of water and dish soap and place it in the microwave. Let it run for just 1 minute on a high temperature or until it steams. Remove the bowl and use a sponge to wipe the inside of your microwave. Don’t forget to clean the microwave door whilst you’re at it.

Clean using baking soda

Baking soda is the go-to cleaner for stuck food in your microwave, amongst other things. Simply make a paste out of baking soda and water and place it on whatever hardened food is stuck in your microwave. Allow it to sit for at least 5 minutes then just wipe it off with a wet sponge or towel. You may repeat the process until you can completely and easily remove the unwanted burnt food inside.

Vinegar and water solution

The process for using this solution is just like the dish soap method. Grab a microwave-safe bowl and mix in one cup of water and vinegar in equal parts.

Place it in the microwave and allow it to steam for quite a bit. Make sure to wipe the unit dry before using it again so that there won’t be any traces of vinegar left inside your microwave.

Vinegar water is a timeless, versatile, natural cleaning product that assists with the removal of stubborn stains and grime. A match made in heaven for an extra dirty microwave.

Using lemon to freshen up your microwave

Like vinegar, lemon is another great, natural disinfectant for a microwave oven, Just cut one lemon in half and place the cut side down on a microwavable plate. Add a few teaspoons of water and put the plate in the microwave until it produces steam. Remove the plate and wipe off the excess liquid inside the microwave, that’s it, it’s really that simple. Again, be sure to wipe down the inside and outside of your microwave door.

Diluted window cleaner for microwave doors

A diluted window cleaner will work wonders for both the inside and the outside of the microwave. Use a rag or a sponge and dip it in the solution and start scrubbing the interior and exterior of your unit. Repeat the process to make sure that the microwave is thoroughly clean. If the smell of the window cleaner bothers you, just use a clean cloth dipped in water and scrub it for one more round.

Using Commercial Cleaners

If you don’t want to risk using other disinfectants to clean your microwave and using lemon, baking soda or vinegar just won’t do the trick, then it’s time to buy readily available commercial microwave cleaners.

One thing you must remember though is to choose a commercial cleaner that won’t leave a bad smell or fumes in your unit that can affect the smell and taste of the food you are cooking.

Easy-Off Microwave Cleaner is a good choice for a fume-free cleaner but there are other products out there. Just go to your local grocery or hardware store and ask for microwave-specific products.  Always be sure to read the instructions and air out your microwave for at least 30 minutes before cooking again.

The hands-off method

Put some dishwashing liquid in a microwave-safe bowl and fill it with warm water. If your microwave needs to be deodorized, add a little baking soda to the mixture.

• Place the bowl in the microwave and run it on high for five minutes.
• Let it stand for another five minutes. Then, remove the bowl. Note: It might be hot.
• Take the turntable out and wipe it off with a damp sponge and dry it with a paper towel.
• Wipe down the surfaces of the microwave with the damp sponge and dry them with a paper towel.
• Replace the turntable.

How to Get a Burnt Smell (and All Smells, Really) Out of the Microwave

When you burn popcorn in the microwave, the smell comes back as soon as you turn it back on. That means it’s best to get rid of the stench right away.

For light odors (spicy food with a strong aroma, for example), air it out by leaving the door open or place a bowl of baking soda inside with the door closed to absorb smells.

For strong odors (think: burnt popcorn), clean any leftover residue and place an odor-absorbing gel inside, like Fresh Wave, until you run it again.

How to Remove Stuck-on Food From the Microwave’s Interior

To get rid of dried-on food, use Good Housekeeping Seal Star Mr. Clean Magic Eraser. If it’s stuck to the turntable, just place the turntable in the dishwasher or wash it by hand with sudsy water. Just make sure you read your manufacturer’s manual beforehand.

Safety Tips & Reminders

• Properly turn off and unplug your microwave before cleaning to avoid any untoward accidents, unless you need to use the heat to clean your device.
• Never put any metallic object inside your microwave.
• Do not use metallic brushes and the like when cleaning your microwave.
• Be careful when using water. Microwave units are electric machines and you might end up damaging your device if you are not particularly careful when using water to clean your device.
• Takeout and clean your microwave’s turntable from time to time. It’s perfectly safe to wash it by hand like any other plate or toss it in the dishwasher.
• Ensure the turntable is completely dry before using again. And never forget to put it back before someone else uses the microwave.
• Always use lids when heating up food or drinks in your microwave. It reduces spatter incidents which maximizes time in between your next unit cleanup.
• If possible, maintain a low setting when using your microwave to reduce chances of spattering or burning food.
• Avoid using strong chemicals when cleaning your microwave. Remember, you are heating up food or beverages in your unit and you don’t want to accidentally consume those chemicals.

How to Properly Store a Microwave

Follow the steps below when preparing your microwave for storage to keep it in prime condition;

1. Remove Glass Components: The last thing you want is to remove your microwave from storage, only to find that the glass components have shattered. Start preparing your microwave for storage by removing the glass tray/plate from the inside. Place this tray separately in a box, and wrap it in a towel, blanket, or bubble wrap for safekeeping.
2. Clean the Unit: Spend ample time disinfecting and cleaning your microwave before you move it. Wipe out the inside of the microwave to remove food particles and built-up grease or grime. Using a vacuum hose, remove any dust or cobwebs from the microwave’s exterior surface, including the power cord.
3. Tape the Door Shut: Even if your microwave door is shut, a strong jostle during the move may cause it to open. Use packing tape to seal the door at the top and bottom of the unit to prevent potential damage. To eliminate any dangling cords, wrap the power cord and tape it to the exterior of the microwave.
4. Box Up the Microwave: While you could move the microwave as a stand-alone item, when storing a microwave, the unit needs to be protected. Find a box that will fit this handy appliance and line the box with foam padding, bubble wrap, or blankets for a secure fit. If you have the original box the microwave was packaged in, you should find that the appliance fits perfectly.
5. Microwave Storing Tips: A microwave should be stored upright in its intended position to avoid any of the inner components from disassembling. Resist the urge to store boxes or items on top of the appliance. Lastly, avoid putting the microwave directly on the ground.
6. Consider Climate Control: Microwaves don’t typically require climate controlled storage, but if you’re storing it in a storage unit long term, you may want to consider climate control to avoid rusting.

Why Did My Microwave Randomly Stop Working?

This could be caused by several issues;

Problem with the door switch

One of the possible reasons for the microwave stopped working and no power could be an issue with the door switch.  A faulty door switch which is also often called an interlock switch is the part that signals the other parts to turn on when the door gets closed and to stop when it is opened. 

To access the door switch, you will have to dismantle the cabinet but only after unplugging the appliance. There are two terminals that must be checked using a multimeter for continuity.  If there is no continuity, then the problem will be with the door switch and replacement might be needed.

Problem with the ceramic fuse

Another cause of the problem of microwave stopped working, no power could be the ceramic fuse.  If the microwave is not starting and the display is also blank then the ceramic fuse may be defective.  This is the part that is responsible for protecting other parts from fluctuations and when it fails, then the microwave also fails. 

Unplug the microwave and then access the fuse from inside the cabinet which is near the power cord.  To check the continuity of the ceramic fuse, make use of a multimeter. If no continuity is observed, you may have to replace the fuse.

Cut out or thermal fuse defects

If there is a problem with the thermal fuse, then this could be leading to no power in the microwave.  Thermal fuses protect the appliance from overheating and to locate it you will have to remove the cabinet after unplugging the microwave.

Disconnect the wires from the terminals and check the continuity using a multimeter.  If no continuity is observed, replace the thermal fuse or cut out.

Problem with the door latch assembly

Another cause of the problem of a stopped microwave could be an issue with the door latch assembly. Door latch assemblies are made using plastic hooks which stick out of the door and signal other parts to power the appliance. 

If the hooks are not working or are damaged, then the switch won’t latch properly and hence the microwave won’t turn on.  Inspect the door latch and replace it if the need be.

If you are still unable to solve any of the issues given above to turn and power on the microwave, then it is better to contact a professional by contacting Mr. Right for Microwave repairs.

Microwave Light Bulb Not Working

Below are some of the possible causes and some solutions;

The Light bulb is burned out

One of the most common causes for microwave light bulbs not working is that the bulb itself may be burned out. To check whether this is the problem and to solve it, you need to first unplug the microwave and then shut off the power to the microwave at the breaker point itself.

Check your microwave to locate the vent and remove its panel by unscrewing the screws. Find the box containing the halogen light and remove its cover. Unscrew the bulb and remove it and install a new one.

Problem with the main control board

Another reason why your microwave’s light bulb may not be working could be a problem with the main control board.  Before you go on to check the main control board, ensure that the bulb, wiring, and sockets, etc are all working fine. Now test the control board by making use of a multimeter.

This will help you ensure that the main control board is sending the right voltage to the socket of the light bulb.  If not, then you may need to get it replaced by a new one and this must only be done by an experienced professional or technician.

Problem with the light socket

Another cause of the microwave light bulb not working could be a problem with the light socket. But before you check or replace the light socket, you will need to replace the light bulb through the method that has been given above. 

However, if the light still doesn’t work then you will need a multimeter to check or test the socket for continuity.  If the light socket doesn’t show any continuity, then in that case you may need to replace it or get it replaced by a professional.

There is a bad contact in the light socket

The light socket brings the bulb into contact with the electric current. Sockets can sometimes be affected by bad contacts, preventing the electricity from reaching the bulb. You can check the socket yourself using a multimeter.

Before carrying out this operation, however, first, ensure you’ve carefully read the safety advice provided at the beginning of this troubleshooting guide. Once you’ve done this, check that there’s definitely a current of 230 volts present at the socket. If the bulb is new but still won’t light up, you will very likely need to replace the socket.

The door latch system is damaged

Microwave door latches are fitted with several small switches. If any of these components is faulty, the light will fail to come on. You can check the door latch mechanism yourself using a multimeter.

Before carrying out this operation, however, ensure you have carefully read the safety advice provided at the beginning of this troubleshooting guide. You will need to carry out the test with the door both open and closed. Each switch should have continuity in one of its two positions.

The main circuit board (PCB) is faulty

The main circuit board PCB is faulty. The main circuit board manages all your microwave’s functions (cooking, turntable motor, light, etc.). If everything else detailed above has been checked, it could be that the circuit board that needs replacing. You can do this yourself, as long as you carefully adhere to the safety instructions provided above. Alternately, you can call on the services of a manufacturer-approved engineer.

Why Is My Microwave Sparking and Arcing?

Arcing, seen as sparks or flashes within the microwave oven, occurs when electromagnetic waves emitted from the magnetron during cooking strike a metallic or reflective surface.

Sparking inside the microwave is common and does not indicate that your microwave has gone bad. When your microwave sparks immediately switch off your microwave and perform the necessary inspection.

The possible reasons for sparking and arcing inside microwave include:

1. Metal inside the microwave

A small metal piece is enough to cause a spark inside your microwave. For example, you may have cleaned the microwave with steel wool and left behind some metal scrap from the wool.

Also, sometimes the food which you heat has a foil covering over it that catches fire. If your heating dish is not microwave safe, there are fair chances of sparking. So make sure that there is no metal scrap and your heating dish is microwave safe before you start cooking food in your microwave.

2. Damaged waveguide cover

There is a cover called waveguide cover over the magnetron which conveys or guides the heat waves to the central area where food is kept. Waveguide cover also prevents any food particle or bug from entering the magnetron.

It is very common that during cooking, some food particles and grease escape the food and stick to the waveguide. The heat emitted from the magnetron burns these stuck food particles, which appear as sparks to us. This spark damages the waveguide cover. A damaged or shorted waveguide cover causes frequent sparks. So the solution is to remove the burned waveguide cover with a new one.

3. Damaged Rack support

Some microwaves have rack supports, which is a hook-like part. If the microwave is sparking near one of the support racks, this means that the paint on the rack has worn out. To remove the support and replace it with a new one.

4. Diode burn

The high voltage diodes could be shorted or burned causing sparking inside the microwave.

5. Using Microwave incompatible cookware

There is a possibility that you’re using utensils that are not compatible with your microwave. Ensure you use utensils suitable for heating food in microwaves.

Note: If you see a spark inside your microwave, immediately switch off the microwave and perform the necessary inspection before calling a technician.

How to Repair an Arcing Microwave

You can stop your microwave arcing by taking a look inside the oven cavity and checking for signs of trouble. Examine your microwave and remove the cause of arcing.

The container or cookware used during cooking may also cause arcing if it is unsuitable for microwave use. Repairing an arcing microwave involves examining and cleaning the inside of the microwave.

• Remove the plastic turntable support and glass plate from the oven.
• Wipe down the inside of the microwave with a soft, soapy cloth, removing any food residue or splashes on the walls, floor and ceiling of the oven. Food stains cause arcing if left inside the oven.
• Wash the turntable support and plate in a sink of soapy water, removing all food residues. Dry everything and reassemble the turntable and plate.
• Check everything you put inside the microwave for metallic edges or trim. Never microwave anything wrapped in tin foil or with metal cutlery still inside.
• Arcing always occurs at the cause of the problem. If you see arcing on the side of a bowl, for example, there may be metal trim beneath the glaze. Stop the microwave as soon as you see arcing.
• Use a different brand of kitchen towel if you are cooking bacon or other food on tissue paper. Some recycled brands of kitchen towel contain tiny traces of metal that cause arcing when microwaved.
• Consider using a reusable fabric kitchen cloth when microwaving on disposable kitchen paper.
• Microwave one container at a time. Arcing sometimes occurs when containers or plates get too close to each other or the walls of the oven.
• Ensure everything you put inside the oven fits within the circumference of the cooking plate. Larger items may strike the wall during cooking and heat unevenly.

Dacor Microwave Shuts Off After a Few Seconds

Problem with the microwave door switch

One of the most common causes of microwave shutting off after a few seconds could be a problem with the microwave door switch.  Check each of the door switches for burning or arcing.  If you see no visible signs of this, then you can take a multimeter and test the switch for continuity.  If you observe no continuity or there are signs of burning, then you may have to replace the door switch.

A door switch might be failing intermittently. Check each of the door switches for signs of overheating, arcing, or burning. If you don’t see any obvious signs of failure, use a multimeter to test each switch for continuity. If any of the switches is visibly damaged or only has intermittent continuity, replace it.

Issue with the main control board

Another possible issue that may be making your microwave go off after few seconds could be an issue with the main control board. But before checking the control board, you must check all the other parts first and ensure that the wiring, etc is done properly. If yes and even, then the problem doesn’t get resolved then in that case you can check the main control board using a multimeter. Replace it if it doesn’t show any continuity.

Note: Control boards are often misdiagnosed—before replacing the control board, first check more commonly defective parts, particularly the door switches. If all of the other components are working properly, replace the control board.

Problem with the control panel or touchpad

If the microwave shuts off after a few seconds then you can also check the control panel or the touchpad. For doing so, you may need to press each of the buttons. If there are only a few buttons that respond and the rest do not then the problem may be with the touchpad and it may need replacing.

To determine if the touchpad and control panel are defective, try pressing each of the buttons on the control panel. If some of the buttons respond correctly while others don’t, replace the touchpad and control panel.

Dacor Microwave Display Not Working

If the display isn’t working at all, either the main control board or the display board could be at fault.

Damaged Main Control Board

If the display isn’t working at all, the main control board could be faulty.

Faulty Display Board

If the display goes out partially, the display board is most likely faulty.

Dacor Microwave not heating

Faulty Diode

The diode converts the A/C power output of the transformer to D/C, doubling the voltage to nearly 5,000 volts. This high voltage powers the magnetron to heat the food. If the diode burns out, the magnetron won’t receive enough voltage to operate, preventing the microwave from heating.

When the diode fails, it is often visibly burned out. Inspect the diode and if the diode is burned out, replace it. If inspecting the diode proves inconclusive, test it with a multimeter that uses a 9-volt battery or put a 9-volt battery in series with the diode. When the leads are reversed, the diode should only have continuity in one direction.

Note; The microwave oven can store a lethal amount of electricity in its high voltage capacitor, even after the microwave oven has been unplugged. Making it extremely dangerous to replace the electronic components in a microwave. As such, you should hire a licensed technician should replace the diode.

Dacor Microwave not working

Blown fuse

If the line fuse blows, the microwave won’t start. To determine if the line fuse is at fault, use a multimeter to test it for continuity. If the fuse does not have continuity, replace it. In addition, you should investigate and resolve the problem that caused the fuse to blow. If you don’t resolve the underlying issue, the new fuse will blow too.

Dacor Microwave light bulb not working

The light bulb itself might be burned out. Replace the light bulb before replacing any of the parts associated with the light bulb

Dacor Microwave turntable not turning

Use a multimeter to test the motor for continuity. If the turntable motor does not have continuity, replace it.

Dacor Microwave Buttons Not Working

To determine if the touchpad is defective, try pressing each of the buttons on the control panel. If some of the buttons respond correctly while others don’t, replace the touchpad.

Dacor Microwave turns on by itself

First, make sure that the touchpad is working properly. If the touchpad is working properly, the main control board is likely at fault. If the control board is defective, replace it.

Dacor Microwave is sparking or arcing

The waveguide cover might be damaged and shorting out. Try removing the waveguide cover and see if the problem resolves. If the waveguide cover is burnt or will not stay in place, replace it.

Whirlpool Microwave Is Not Heating

Diode. The diode converts the A/C power output of the transformer to D/C, doubling the voltage to nearly 5,000 volts. This high voltage powers the magnetron to heat the food. If the diode burns out, the magnetron won’t receive enough voltage to operate, preventing the microwave from heating.

When the diode fails, it is often visibly burned out. Inspect the diode and if the diode is burned out, replace it. If inspecting the diode proves inconclusive, test it with a multimeter that uses a 9-volt battery or put a 9-volt battery in series with the diode. When the leads are reversed, the diode should only have continuity in one direction.

Whirlpool Microwave not working

Line Fuse. If too much current passes through the microwave circuitry, the line fuse will blow. If the line fuse blows, the microwave won’t start. To determine if the line fuse is at fault, use a multimeter to test it for continuity. If the fuse does not have continuity, replace it. In addition, you should investigate and resolve the problem that caused the fuse to blow. If you don’t resolve the underlying issue, the new fuse will blow too.

Note: The microwave oven can store thousands of volts of electricity in its high voltage capacitor, even after the microwave oven has been unplugged. Due to the potential for electric shock, it is extremely dangerous to replace the electronic components in a microwave. Only a licensed technician should replace the line fuse.

Whirlpool Microwave light bulb not working

Light Bulb. The light bulb itself might be burned out. Replace the light bulb before replacing any of the parts associated with the light bulb

Whirlpool Microwave shuts off after a few seconds

Door Switch. A door switch might be failing intermittently. Check each of the door switches for signs of overheating, arcing, or burning. If you don’t see any obvious signs of failure, use a multimeter to test each switch for continuity. If any of the switches is visibly damaged or only has intermittent continuity, replace it.

Whirlpool Microwave turntable not turning

Turntable Motor. Use a multimeter to test the motor for continuity. If the turntable motor does not have continuity, replace it.

Whirlpool Microwave buttons not working

Touchpad. To determine if the touchpad is defective, try pressing each of the buttons on the control panel. If some of the buttons respond correctly while others don’t, replace the touchpad.

Whirlpool Microwave turns on by itself

Main Control Board. First, make sure that the touchpad is working properly. If the touchpad is working properly, the main control board is likely at fault. If the control board is defective, replace it.

Whirlpool Microwave is sparking or arcing

Waveguide Cover. The waveguide cover might be damaged and shorting out. Try removing the waveguide cover and see if the problem resolves. If the waveguide cover is burnt or will not stay in place, replace it.

Whirlpool Microwave door won’t open

Door Hook. The door hook engages with the door latch to keep the door closed during operation. Since the door hook is made of plastic, it can break due to regular wear. If the door hook is broken, it won’t release the door properly, preventing the door from opening. If the door hook is broken, replace it.

Whirlpool Microwave exhaust fan not working

Exhaust Fan Motor. To determine if the fan motor is defective, remove the fan motor from the microwave and try turning the fan blades by hand. If the blades do not turn freely, replace the fan motor. If the fan blades do turn freely, use a multimeter to test the motor for incoming power and for continuity. If the motor has power but won’t run, replace it. If the motor does not have continuity, replace it.

Whirlpool Microwave is loud or noisy

Damaged Magnetron. The magnetron uses high voltage, high current DC power to generate the microwave frequency that cooks the food. Under normal circumstances, the magnetron emits a low hum.

However, if the magnetron is damaged or nearly burned out, it may begin emitting high-pitched sounds or growling noises. If the magnetron is noisy, this indicates that the magnetron is nearing the end of its life or might be defective.

A defective high-voltage diode can also cause the magnetron to be loud. Before replacing the magnetron, first test the high voltage diode. If the diode is not defective, replace the magnetron.

Note: The microwave oven can store a lethal amount of electricity in its high voltage capacitor, even after the microwave oven has been unplugged. Only a licensed technician should replace the magnetron.

How to Reset a Whirlpool Microwave?

Here are the steps to reset your Whirlpool Microwave if your microwave is experiencing issues:

• Disconnect the power cord from the power source.
• This step is absolutely critical to the correct resetting of the fuse. You do not want to reset the fuse while the power is on.
• Remove any items from the shelf in the microwave, such as plates or food
• Place a towel over the glass so that you do not scratch it with anything sharp when removing it.
• Remove all of the screws from inside of your microwave, except for one that is located at the back of your microwave.
• Pull the microwave cover out of place and remove it.
• Remove the fuse from the back of the microwave and set it aside.
• Locate your reset button on your microwave. This is usually found on the front or back of the oven. It may be labeled “microwave” or “overheat.”
• Sometimes it may have a “reset” button instead, but they are all essentially the same.
• Press this button and the microwave will reset.

All Whirlpool Microwave Error Codes, Their Meaning and Fixes

If you’re looking for help fixing your Whirlpool Microwave, look no further! Our comprehensive Whirlpool Microwave error code guide will explain common issues, provide tips, and show you how to read your model’s error codes.

CODE: “:” or “.”

PROBLEM: There has been a power failure, or the clock time has been turned off. 

FIX:

Power unit down by turning off the circuit breaker(s) for one (1) minute.

Power unit up by turning on the circuit breaker(s).

Monitor the oven for one (1) minute to ensure the error code does not display again.

Verify oven operation.

CODE: DOOR or OPEN and CLOSE DOOR

PROBLEM: If a message about the door appears in the display, the door has been closed for 5 minutes or more without the microwave oven being started.

FIX:

Remove all packing material from the Microwave.   

Be sure no packing material is blocking the door lock system.

Close the door firmly.

Check that the cooking rack (if equipped) is not out of position and not allowing the door to close.

CODE: Err7 

PROBLEM: There may be a problem with the User Interface or Keypad, the Control, or the associated wiring.

FIX:

Power unit down by turning off the circuit breaker(s) for one (1) minute.

Power unit up by turning on the circuit breaker(s).

Monitor the oven for one (1) minute to ensure the error code does not display again.

Verify oven operation.

CODE: ERROR during sensor cooking

PROBLEM: The sensor is not detecting humidity.

FIX:

Power unit down by turning off the circuit breaker(s) for one (1) minute.

Power unit up by turning on the circuit breaker(s).

Monitor the oven for one (1) minute to ensure the error code does not display again.

Verify oven operation.

CODE: Feature Not Available or Fault Detected

PROBLEM: This message will scroll across the display when a fault is detected while you are programming a cook cycle.

FIX:

Power unit down by turning off the circuit breaker(s) for one (1) minute.

Power unit up by turning on the circuit breaker(s).

Start a bake cycle.

Monitor the oven for one (1) minute to ensure the error code does not display again.

Verify oven operation.

CODE: Flashing Time, Clock, 12:00, Power Loss or Enter Time

PROBLEM: When power is first supplied to the oven, after a power interruption or failure, the “Time”, or “12:00”, or “POWER LOSS” will be displayed. 

FIX:

Press CANCEL to clear the display.

Set time of day.

CODE: Locked, Lock or Loc

PROBLEM: The Control Lock shuts down the panel controls to avoid unintended use of the microwave oven. When the control panel is locked, none of the controls will function.

FIX:

Power unit down by turning off the circuit breaker(s) for one (1) minute.

Power unit up by turning on the circuit breaker(s).

Monitor the oven for one (1) minute to ensure the error code does not display again.

Verify oven operation

CODE: No Beeps or Tones

PROBLEM: Is the tone function turned off?

FIX:

If the range is in Energy Save mode (select models), the display will be blank when not in use. The Energy Save mode puts the product into sleep mode and reduces energy consumption.

To Deactivate the Energy Save Mode:

• Press and hold SETTINGS/CLOCK for 3 seconds.  “Energy saver off” will appear in the display.
• The clock will reappear in the display and the range can be operated as usual.

To Activate the Energy Save Mode:

• Press and hold SETTINGS/CLOCK for 3 seconds.  “Energy saver on” will appear in the display.  
• The setting will be activated after 5 minutes.

CODE: Press Cancel to Reset

PROBLEM: This message will be displayed when a fault or error has been detected.

FIX:

• Power unit down by turning off the circuit breaker(s) for one (1) minute.
• Power unit up by turning on the circuit breaker(s).
• Start a bake cycle.
• Monitor the oven for one (1) minute to ensure the error code does not display again.
• Verify oven operation.

CODE: Probe or Insert Probe

PROBLEM: The Control is “looking” for input from the Meat Probe.

FIX:

• Power unit down by turning off the circuit breaker(s) for one (1) minute.
• Power unit up by turning on the circuit breaker(s).
• Monitor the oven for one (1) minute to ensure the error code does not display again.
• Verify oven operation.

Whirlpool Microwave Display Not Working

Ensure the door is fully closed

Below are some common items that may prevent the microwave from closing or opening:

• Packing and/or shipping material
• Dish or bakeware.  Ensure the dish is the correct size for the microwave, an oversized plate will prevent the door from closing.
• Ensure that the cooking rack is not out of position and not allowing the door to close

NOTE: To avoid unintentional operation of the microwave oven, a cooking function cannot be started if the microwave oven door has been closed for about 5 minutes. The word “door” will appear in the display until the door is opened and closed.

Power Disruption

If the microwave lights will not turn on, when the door is opened, check to make sure there is power going to the microwave. If the power supply coming to your microwave isn’t proper, then this could be leading to the off display of the appliance.

Check the following:

• Verify the power cord is connected to an operational outlet.  
• If you are not sure whether the outlet is operational, and the outlet is easily accessible.
• Connect a known operating small appliance with similar power cord to the outlet to verify the outlet is operational.
• Verify the circuit breaker hasn’t tripped or blown a fuse.

Faulty Main Control Board.

If the main control board or circuit board is at fault, then you may be facing an issue of missing digits or lines.  This problem is usually caused by a missing solder or a faulty capacitor.  For this, you can look at the circuit inside the appliance and look for the broken line.

Solution for broken main circuit board

If the broken line is easily located by you, then the solution for this is to solder it with a soldering iron.  However, if you are inexperienced or not comfortable with circuits then it is best to look for professional help or call an experienced technician to help you.

Blown Temperature or Monitor Fuse(s)

If the microwave display is not working, then you must also check the temperature and the monitor fuse as well. Ensure that they are not both blown away.  Each microwave type and brand will have fuses located in different parts or spots of the appliance.

Solution for blown fuses

Locate the fuses by referring to the user manual. Once located, take the fuse out and check the thin wire inside it.  If it is discolored, then it may be blown off.

Loose Wires

If it’s not a power problem, then the issue really is inside your microwave display and control panel. To access this, you’re going to need to remove the control panel and take a peek “under the hood” to see if you can spot any problems that could be easily fixed.

• Unplug your microwave from the wall so there’s no risk of getting a shock when you access the wires behind the panel.
• Keep in mind that the capacitor inside the microwave can still store voltage for a long period of time even after unplugging the unit.
• It may require a manual discharge, which you should not attempt without training and prior experience.
• Look for mounting screws along the top front of your microwave, which covers the front vent.
• Remove the screws then open the door and pull the vent free. With the door open, you’ll see additional mounting screws securing the panel to the microwave cabinet.
• Remove those screws, then carefully pry the panel open, pressing any clips along the edges.
• There will be wires connecting the panel and the microwave.
• Secure these wires firmly and/or disconnect and reconnect each wire harness.
• If there’s a loose wire, it can be repaired with this method.
• When all the wires are secure, close the panel back up and press until the clips click.
• Then return the mounting screws, the vent cover, and the vent cover’s mounting screws.
• Plug the microwave back in and give the panel a try.

Note: this is very dangerous and should not be attempted by amateurs. If you are new to DIYs consider hiring a professional.

Damaged Control Panel

If nothing else has worked, your next option is to consider replacing the control panel. In most cases, you’re better off trying to replace the entire panel assembly than trying to pinpoint exactly which small electric component went wrong and how to fix it.

If you do choose to replace the panel, you will need to look up specific information on this repair based on the brand and model of your microwave. This will determine where your mounting screws and clips are located and the exact steps to exchange one control panel for a replacement.

Note: Please remember to unplug the microwave before performing this repair. If you are uncomfortable taking apart your microwave or working with appliance wiring, there’s another option. Lastly, ensure you order the exact replacement parts for your microwave model.

Whirlpool Microwave Display Symbol Meaning

The microwave function allows to quickly cook or reheat food and beverages. You can use the microwave setting to quickly defrost or heat up food. Other than that, the microwave is very suitable for boiling vegetables and potatoes.

If you boil those in a microwave, you need far less water than you would in a pan. This way, the vitamins in the food are retained, and you won’t pour them out with the water.

Check this too: Whirlpool Dryer How to & Troubleshooting Guide

Whirlpool Microwave Door Error

Below are possible solutions for the door error issue;

Restart the cycle

If a message about the door appears in the display, the door has been closed for 5 minutes or more without the microwave oven being started. This occurs to avoid the unintended starting of the microwave oven. Open and close the door to restart the cycle.

Check if the door fully closed

• Remove all packing material from the Microwave.  
• Be sure no packing material is blocking the door lock system.
• Close the door firmly.
• Check that the cooking rack (if equipped) is not out of position and not allowing the door to close.

Clean the microwave

Dirt or dust is built up around the door’s contact area, which will show the door error. In addition, it will cause issues in the functionality and you won’t be able to use the microwave.

Inspect the contact area of the microwave’s door and clean up the dirt, if it’s built up. When you have to clean up the built-up dirt and dust, make sure that you plug out the power cable of the microwave.

Check for obstructions

Packing material sometimes interferes with the microwave door’s closure. When the packing material is removed, the door will shut off properly and the door error will go away. In addition to the packing material, make sure that nothing else is blocking the door lock.

Level the Microwave

Place the microwave on a flat surface to ensure that the closing and opening of the microwave’s door are not blocked. If there is any blocking in the door’s opening and closure, it will result in the door error.

Inspect Microwave Door Closure

Check the closure of the microwave door. If the door is not closed properly, it may result in a door error. As such, you have to open the microwave door and close it firmly. When the door is firmly closed, we are pretty sure that the door error will go away.

Fix Microwave Door Switch

The door switch is responsible for making contact with the door. In addition, there are chances that the switch is making a contact, but incorrectly. For this reason, you must change the door switch and it’s best to call the technician.

Replace Door Latch

If the door is hanging lose it will not close firmly. This is because the door latch is worn out or is damaged. To fix this issue, you have to replace the door latch and make sure that it’s compatible with the microwave model.

As a rule of thumb, change the door latches regularly to make sure the latches keep working.

Whirlpool Microwave Troubleshooting

If you’re looking for help fixing your Whirlpool Microwave, look no further! Our comprehensive Whirlpool Microwave Troubleshooting guide will explain common issues, provide tips, and show you how to read your model’s error codes.

General Troubleshooting

• Plug the microwave in fully.
• Check the household fuse or breaker box.
• Push thrown breakers to the “On” position or replace blown fuses, if needed.
• Press and hold the “Off” key for five seconds to unlock the controls if “Locked” is shown on the display.
• Turn off “Demo Mode” if the timer counts down rapidly when a cooking cycle is started.
• Press and hold the “Timer Set/Off” key for five seconds.
• Place 1 cup of cold water inside the microwave.
• Close the microwave door and set a two minute cooking cycle.
• Open the door and test the temperature of the water.
• If the water is not warm, the magnetron is not working properly and should be repaired.

Turntable Troubleshooting

• Start the microwave oven and watch the turntable. If the turntable does not rotate, proceed to the next step.
• Place the turntable on the turntable support correctly if the turntable does not work.
• Remove the turntable and clean the hub, rollers and support with mild dish detergent and warm water.
• Rinse and dry.
• Replace the hub, support and turntable.

Display Messages Troubleshooting

• Reset the clock if “:” is shown on the display.
• Press the “Clock” key. Use the number keys to enter the correct time.
• Press the “Clock” key to set the time.
• Unlock the controls if “Locked” appears on the display and you wish to start a cooking cycle.
• Press and hold the “Off” key for five seconds to unlock the controls.
• Press the “Timer Set/Off” key two times to cancel the timer if the time is counting down on the display and the timer is no longer in use.

How to Set the Whirlpool Microwave Clock

• Press the OPEN button
• Press CLOCK
• Enter the clock time
• Pause till the display reads “Clock Saved”
• Resume normal operation

How to Reset a Galanz Microwave

Factory Reset

If you want the oven returned to the default factory setting;

• Press Start pad and plug in the oven until “00 ： 00” shows on the screen.
• Then press the following pads one by one: “1”,”2″,”3″,”4″,”5″,”6″,”7″,”8″,”9″,”0″, “Power Level”,”X2″,”Prog”,”Switch”,”+”,”-“,”Stop/Reset”, “Start”.
• The screen will show “00 :18”.
• Open and close the door, then open it again.
• A Beep will be heart to signal the oven is back to factory setting

Hard Reset

• Locate the plug of the microwave and pull that plug out of the socket.
• Wait for two to three minutes before plugging in the microwave.
• Turn on the microwave and set the time of the day by pressing the Clock button. Press the dial to enter the time, minutes, and the am/pm.

To Cancel a Function

• Press the Stop/Reset Button

Galanz Microwave Buttons Not Working

Defective Control Panel

In most cases of microwave buttons not working, the common cause comes out to be the defective control panel. If you wish to confirm whether this is the real issue, then for this you will have to press each of the buttons on the control panel. If some of the buttons are working fine while others are not then you may have to replace the touchpad and the control panel.

Problem with The Membrane Switch

Another possible cause of microwave buttons not working could be an issue with the membrane switch. The membrane switch is more commonly known as the touchpad and has a few soft-touch electrical switches. There is a certain conductive coating on the touchpad which can go defective with repeated usage. To check this issue and to resolve it, you will need to unplug the appliance and remove the cabinet. Check the membrane switch using a multi meter for continuity. When pressed, it should show a few ohms of resistance. If not, you may need to get it replaced.

Problem with The Control Board

If microwave buttons on your microwave are not working, then another possible reason behind this could be an issue with the control board. If the touchpad of your appliance does not respond but the display lights go on, then this could be the issue. The control board is responsible for generating a low voltage which is in turn supplied to the membrane switch.  In case the control board doesn’t generate a low voltage signal then you may need to replace it.  to replace the unit, you will first have to disconnect the main power supply and then remove the cabinet and the assembly.

Galanz Microwave Start Button Not Working

Control Lock Activated

The Control Lock disables the control panel pads to avoid unintended use of the microwave oven. If the control lock is activated the microwave will not start. Refer to the Owner’s Manual for instructions.  Refer to your Owner’s Manual for specific information on your model.

Faulty Control Board

The control board of your microwave is the brain of your microwave, and as such, if there is something wrong with it, then it will be hard to miss. Among the many issues that can manifest with a faulty control is the buttons not working.

When you press a button on your microwave, it is supposed to send electrical signals to the other components through the control board so it works. If the board is gone faulty, then those electrical signals may not get delivered.

However, if your microwave is manifesting more issues than just a button not working, it is almost assuredly a control board issues. Once the control board starts to go out, it will manifest many different kinds of issues throughout your microwave.

Defective Touch Pad Membrane

From the control panel, you can disconnect the control board by removing the mounting screws and disconnecting a ribbon. This ribbon connector will lead you to the touchpad membrane of your microwave. If your microwave doesn’t have any other issues, but certain buttons have a spotty function or no function at all, then it is likely a touchpad issue.

The touchpad membrane consists of soft electrical switches that are sandwiched in mylar sheets. Once pressed, they complete an electrical circuit that gives the control board the information that it needs. However, the layer that creates conductivity can wear down after years of use.

Once this happens, the button or buttons will cease to function. You will usually find that this happens most frequently in the “Start” button as it is the button that we use most often. However, any control has the potential to wear down after repeated use.

Once the control board has been removed from the control panel, you will typically find the membrane attached to the inside of the control panel. The membrane can be peeled off, but you may wish to test it with a multimeter first to discover if it really is the fault.

Once the new touchpad membrane has been applied, you can connect it to the control board via the ribbon connector. Once the control board is re-mounted, it can then be reconnected to the wires and mounted back onto your microwave for testing.

Child Lock feature is active

To test if the CHILD LOCK feature is deactivated:

Press the STOP/CLEAR button on the microwave’s keypad.

Press and hold the START/ENTER key for approximately 4 seconds until the L indicator or a lock icon appears in the display. If your model’s STOP/CLEAR button does not have a lock indicator on it, please refer to your owner’s manual to see if your unit has CHILD LOCK and, if so, how to deactivate it.

Press and hold the START/ENTER key again for approximately 4 seconds. The L indicator or lock icon should disappear from the display.  

Deactivate Child Lock

If the controls are still not responding, attempt a reset on the microwave by unplugging the unit for 2-3 minutes. Plug the microwave back in and attempt the use the microwave again. If the controls are still not responding, the microwave will require repair service.

How to Reset the Microwave

• Power unit down by turning off the circuit breaker(s) for one (1) minute.
• Power unit up by turning on the circuit breaker(s).
• Verify operation.

How to Reset a Greystone Microwave

Unplug the microwave for a few minutes to allow its circuitry to fully power down, and then plug it back in. This will reprogram the microwave’s code and reset it.

Why Is My Greystone RV Microwave Not Working?

Interrupted Power Supply

It is best to inspect the power source first before assuming that there is something wrong with the microwave itself. You will need a voltage tester or a multimeter to check the power output on the outlet you use for your RV microwave.

There are a handful of things that can create problems for your outlet. If there is no reading on the multimeter then you need to fix the outlet.

The outlet issue can be traced back to damaged wires or faulty breakers. In the meanwhile, you can try using an extension cord to power your microwave from another outlet in your RV.

Ensure the power requirements on your microwave are within the capacity of your power supply. Otherwise, putting excessive load on the power system can create other problems for you in the future.

Blown Fuse

If there is no issue with the power supply, then you need to check the fuse in your microwave. Depending upon the model of the microwave, there should be around 2 fuses on the back of the microwave.

You will need to take out the back metal cover and replace these fuses if they are blown. You will find the first fuse right away and to access the second fuse you will need to remove the metal plate.

There is nothing complicated about replacing fuses. You will just have to take out the old fuse and put the new one in its place.

Check this too: How to Stop a Fire Alarm from Beeping

Your basic toolkit should be enough to help you throughout the replacement procedure. You can also look up some guides online if you don’t feel confident about changing the fuses.

Replace RV Microwave

If the problem is still there after replacing the fuses, then it is probable that the internal circuitry is damaged. Usually, this problem occurs after a power surge and depending upon the intensity of the power surge it can fry the circuits if you don’t have surge protectors installed.

Note: Don’t attempt to fix the internal circuits yourself. It is unlikely that you will be able to fix the microwave unless you’re a technician yourself.