Microwave Fan Won’t Turn Off: Here’s What to Do?

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Microwaves are an essential appliance in modern kitchens, providing quick and convenient cooking solutions. However, like any device, they can encounter issues that require troubleshooting.

One common problem that microwave owners face is a persistent fan that won’t turn off even after the cooking process is complete.

In this comprehensive blog post, we will explore the various reasons behind this problem and provide you with step-by-step solutions to resolve it

What actually causes the microwave fan not to turn off?

If your microwave fan won’t turn off, it could be due to a few different reasons. The most common reason is that the fan is stuck in the on position and needs to be reset. Other potential causes include a faulty switch or a problem with the wiring or simply faulty air filters.

Understanding Microwave Fan

Before delving into the potential causes of a continuously running microwave fan, it’s essential to understand its purpose. The fan in a microwave serves three primary functions:

Heat and Steam Ventilation

When you cook food in a microwave, especially for longer durations or at high power settings, heat and steam can accumulate inside the cooking chamber.

The fan helps to vent this heat and steam, preventing the buildup of moisture and maintaining a cooler environment inside the microwave.

Odor Removal

Certain foods, such as fish or strong-smelling dishes, can leave behind lingering odors inside the microwave.

The fan aids in removing these odors by circulating the air and pulling it through a filter, which helps to capture and neutralize the odorous particles.

Air Circulation

The fan promotes better air circulation within the microwave, which can help distribute heat more evenly during cooking.

This feature is particularly useful when preparing larger or more complex dishes that require consistent heating throughout.

1. Faulty Microwave Filters

Microwave air filters are designed to capture grease, smoke and odors that are produced when cooking.
Faulty filters are one of the most common reason for a microwave fan not turning off. If your air filter is dirty or clogged, it can block the flow of air and cause the fan to stay on.

To clean your air filter, remove it from the microwave and wash it with warm soapy water. Let the filter dry completely before putting it back in place.

2. Faulty Microwave Fan

A fan motor is a device that helps circulate air within a given space. This can be used to cool or ventilate an area as needed. In some cases, the fan motor may also help to circulate heat.

If the fan doesn’t turn off even when the door is open, it could be because the fan motor is defective. In this case, you will need to replace the fan motor.

Unplug the microwave and remove the screws that hold the top panel in place. Take off the top panel and locate the fan motor. Unscrew the motor and remove it from the microwave.

Install a new fan motor and screw it in place. Replace the top panel and screw it back on. Plug in the microwave and test it to see if the problem is fixed.

3. Problem with the Grease Filter

The microwave grease filter is a metal mesh screen that catches grease and other particles that can come off of food as it cooks.
It is usually located behind the microwave door, on the top or bottom of the microwave cavity. Over time, the filter can become clogged with grease and other debris, which can cause problems with the microwave’s performance.

If your microwave has a clogged grease filter, it may be the reason why your fan won’t turn off.

To clean the filter, simply remove it and wash it with warm soapy water. Rinse it thoroughly and dry it before putting it back in place. If the filter is badly damaged, you will need to replace it with a new one.

4. Bad Capacitor

Another possible reason why your microwave fan won’t turn off is because of a bad capacitor. The capacitor helps to store electricity so that it can be used when needed. If the capacitor is damaged, it can cause all sorts of problems, including the fan not turning off.

To test the capacitor, you will need to use a multimeter. Set the multimeter to the “capacitance” setting and touch the probes to the two terminals on the capacitor. If the reading is zero, then the capacitor is working properly.

If the reading is infinity, then the capacitor is defective and needs to be replaced.

5. Faulty Thermostat

A microwave thermostat is a type of electronic thermostat that uses microwaves to sense the temperature of an object. It consists of a microwave receiver and a control unit.

The receiver measures the intensity of the microwaves emitted by the object and converts it into a temperature reading. The control unit then adjusts the heating or cooling of the object accordingly.

The thermostat is responsible for turning the fan on and off based on the temperature inside the microwave. If the thermostat is damaged or not working properly, it may cause the fan to stay on even when the microwave is turned off. You will need to replace the thermostat to fix this issue.

Microwave thermostats are also commonly used in industrial applications, where they are used to control the temperature of large objects such as ovens, furnaces, and boilers. They are also used in some home appliances such as microwave ovens and clothes dryers.

6. Microwave Overuse

If you find that your microwave’s fan doesn’t turn off even when you’re not using it, it’s likely because the fan is overworked. When you use the microwave frequently, the fan has to work harder to keep the appliance cool, and this can cause it to wear out over time.

If your microwave is more than a few years old, it’s probably time to replace it.
Additionally, if you use the microwave for long periods of time or if you cook large amounts of food in it, the fan may overheat and shut down.

This is a safety feature that is designed to protect your microwave from overheating and catching fire.
If your microwave fan won’t turn off, unplug the appliance and let it cool down for at least 30 minutes before plugging it back in and trying again. If the problem persists, contact a qualified repair technician for assistance.

7.  High Temperatures

If your microwave fan won’t turn off, it could be because the kitchen temperature is too high. The fan is designed to keep the interior of the microwave cool, so if the room temperature is too warm, the fan will run continuously in an attempt to maintain a ideal cooking environment.

Try turning on a window air conditioner or opening a window to help lower the kitchen temperature and see if that stops the fan from running constantly.

GE Microwave Fan Won’t Turn Off

If your GE microwave fan won’t turn off, it could be due to a few different issues. First, check to make sure that the fan is turned on. If the fan is turned on, but still won’t turn off, it could be because the venting system is blocked.

Finally, if the fan is still not turning off, you may need to reset the microwave.

First, check to make sure that the fan is turned on. The fan will usually be located near the top of the microwave, and will have a switch that you can use to turn it on and off. If the switch is in the “off” position, then the fan will not turn on.

If the fan is turned on, but still won’t turn off, it could be because the venting system is blocked. The venting system is what allows air to circulate through the microwave, and if it’s blocked, the fan won’t be able to do its job.

To check if the venting system is blocked, remove the cover from the top of the microwave and look inside. If you see any obstruction, such as a piece of paper or plastic, then gently remove it and see if that clears up the problem.

Finally, if the fan is still on and not turning off, you may need to reset the microwave. To do this, unplug the microwave from the power outlet and then plug it back in.

Once it’s plugged back in, press and hold the “reset” button for about 30 seconds. This should clear any settings that may be causing the fan to stay on, and hopefully get it working again.


There are many benefits to having a microwave fan. One of the most obvious benefits is that it can help to circulate air and keep your kitchen cooler. In addition, a microwave fan can also help to remove odors from your kitchen.
Additionally, a microwave fan can also help to prevent food from burning and ensure that your food cooks evenly.

Finally, a microwave fan can also help to prolong the life of your microwave by preventing it from overworking.
Above all these benefits, the microwave fan may develop some mechanical itches that will make it not to turn off. If that’s the case, then the above guide is highly recommended for you.



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