Skip to Content

Kitchenaid Microwave Not Heating: Why & How to Fix?

Microwaves made by Kitchenaid are among the most popular household appliances. However, they are prone to breakdowns like any other appliance.

You can try a few things to fix your Kitchenaid microwave if it is not heating. Here are some reasons why microwaves might not work, and how to fix them.

Kitchenaid microwave not heating

Kitchenaid microwaves that do not heat may be caused by faulty fuses, malfunctioning diodes, broken door switches, defective capacitors, and faulty magnetrons. Further, if your microwave does not heat, the problem could be caused by the power cord or the thermal protector.

The first step is to make sure the power is on and an outlet is plugged in. Next, check if anything is blocking the fan or heating the Tesla coil.

Something inside the microwave is likely blocking the flow of microwaves if neither of these things is the problem. Other reasons for different models can be found here.

Kitchenaid microwave kmhs120ess

There may be a problem with the circuit breaker, transistor, or magnetron in your Kitchenaid microwave if it does not heat. To fix the problem, you will need to check and possibly replace these components. These are the reasons for the decision:


When the fuse blows, the power is cut off. It is necessary to replace the fuse to resolve this problem.


A diode can fail if it is exposed to too much voltage or current. You may need to replace the diode or check for damage and correct it if necessary.

Door Switches: 

Switches on the doors may not be functioning properly and need to be replaced most of the time.


Capacitors can malfunction when they become charged up too quickly, resulting in a microwave that does not work. You will need to replace the capacitor to resolve this issue.


Occasionally, a magnetron can fail and emit incorrect microwaves, preventing the oven from heating. The magnetron on most models needs to be replaced to fix this issue

KitchenAid KMBS104 microwave

KitchenAid KMBS104 microwaves may not heat up for many reasons. These components will need to be checked and possibly replaced to fix the problem. The reasons for this are as follows:

The power switch may be positioned incorrectly:

The power switch may be positioned incorrectly. If this is the case, you will need to rotate the power switch in the direction that corresponds to the arrows on the front of your microwave.

There might be a problem with the magnet:

There may be a problem with the magnet’s attachment to the door. To fix this, you will need to remove the screws attaching the magnetron to the door and replace them if necessary.

Thermo protector cuts off microwave power:

You will need to replace the thermal protector if it is cutting off the microwave’s power.

Open the front of your microwave and locate the screw that attaches the Thermo protector to the chassis. Replace this screw with a new one after removing it.

Is it worth fixing a Kitchenaid microwave that won’t heat?

Fixing a KitchenAid microwave that won’t heat is usually very easy and doesn’t require any special tools. You’ll be back up and running in no time if you have a few simple screwdrivers.

If it’s something more serious, such as a blown fuse or damaged component, then you should definitely call a repairman, but for most repairs, you should be able to handle it yourself.

You might be able to repair your Kitchenaid microwave if it’s designed to be repaired. Having a broken microwave may result in the food not being heated properly or even causing a fire.

Whenever you suspect that your microwave is malfunctioning, take the appropriate steps to fix it as soon as possible.

The KitchenAid warranty covers manufacturing defects in their appliances for three years from the date of purchase, so you can always contact them for assistance.

Additionally, many home improvement suppliers offer warranties on Kitchenaid products and can assist you with repairs or replacements.

How do I know if my Kitchenaid microwave fuse is blown?

Whenever your microwave doesn’t seem to be able to heat up, or if it blows out at a rapid pace, then it could be because the fuse in the microwave has blown. If you want to check, you can follow the guidelines below:

Inspect some basics:

When you flick the switches, does the power come on? What is the status of all the lights? When you open the microwave, do you hear anything inside? If any of these things aren’t working properly, you may need to replace a fuse.

Check the fuse box:

You might be able to get power from somewhere else in your house if you don’t have a spare. Could another outlet nearby be supplying power to your microwave? It may be time to replace the fuse if this is the case.

Use an ohmmeter:

When you touch two probes together next to where the blown fuse should be, you will be able to determine whether or not there is any resistance.

It’s possible to see a resistor on an ohmmeter reading if there’s a blown fuse (assuming the circuit still works).

Check fuse manually:

You can replace a blown fuse with a temporary fix by manually shorting out the wires near where the blown fuse should be. Take a reading with an ohmmeter by touching one probe to each wire.

If your microwave still works, proceed to step 5. You will need to replace the entire microwave (or at least a part of it) if that circuit isn’t working.

How much does it cost to replace the magnetron in a Kitchenaid microwave?

Depending on the model and condition of the microwave, replacing the magnetron can cost between $150 and $250.

Labor, parts, and disposal fees may also be included in this cost. If your microwave does not have a magnetron, then it will likely need to be replaced.

If your microwave is still under warranty, the manufacturer may be willing to cover the cost of a new magnetron. It is recommended that you check your owner’s manual or call customer service before making this costly repair.

There may be spare parts available for older models, which you can use instead of buying a new unit.

How to fix the Kitchenaid microwave not heating?

Your Kitchenaid microwave may not be heating for several reasons, from a blown fuse to a circuit board issue.

Most often, repairing or replacing the machine will be the best option. You can try some troubleshooting tips below if you’re not sure if it’s worth getting professional help:

Check for power and ground:

Check that all wires leading into the microwave are connected properly to both gator clips or another suitable testing device. A problem with one of these cables might indicate a problem with the power supply rather than the machine itself.

Check for blown fuses:

There are times when blown fuses can be traced back to the source of appliance problems. You should check all the fuses in your microwave if you have access to it, and if any of them are blown or damaged, you should replace them.

Look for signs of interference:

It could be that something is blocking electricity from reaching or interfering with your microwave’s circuits, resulting in poor performance or no heat at all. Unplug other electrical devices close to see if this fixes the problem.

Check for weak or interrupted power:

It is sometimes possible to solve a problem with the circuit board by replacing it altogether. If this is not an option, then check for signs of electrical interference that may weaken the signal coming into the machine.

Reset the microwave:

Occasionally, resetting your microwave can solve the issue completely when everything else seems to check out. Take the following steps: Close all door panels and remove all food products from inside the microwave/oven.

Open microwaves/ovens and disconnect the power supply. Disconnect all wires from the circuit board, taking care not to touch any hot surfaces. Reconnect the power supply and press the OK button on the front panel.

Final Thoughts

The Kitchenaid microwave is not heating due to a faulty fuse, transistor, control panel, coil, or magnetron. It may be necessary to conduct a thorough check of the power supply, reset the machine, or replace the circuit board to resolve this issue. If necessary, replace the magnetron.