This is normal. The microwave oven’s cooling fan (on some models), which is separate
from the vent fan, automatically comes on during microwave oven operation to cool the microwave oven. It may also automatically come on and cycle on and off to cool the microwave oven’s controls while the cooktop below is being used. It may stay on for up to 1 hour to cool the microwave oven. When this occurs, the vent fan cannot be turned off. This is normal. The vent fan will automatically turn on during any cook function (on some models), acting as a cooling fan to protect the microwave. Please click below to learn more on how you can save up to 25% on New Appliance Extended Service Plans within 30 days of your appliance purchase. CanadaInterested in purchasing an Extended Service Plan?Please click below to learn more on how you can save up to 25% on New Appliance Extended Service Plans within 30 days of your appliance purchase. United StatesCanada jeff1Appliance Tech - Moderator
Hi, Where you cooking undernath the microwave? The base often has a thermostat that will close and turn on the exhaust fan if the base gets too warm.....thermostat could have been doing it's job if you where cooking or the thermostat could be funky if turning on the fan by itself. jeff. jeff1Appliance Tech - Moderator
The control panel would not allow us to turn off the fan, but it went off by itself a while later when things cooled down. Yupper, the safety thermostat bypasses the regular controls and will evenually shut off the fan once the bottom has cooled down. jeff. Best →
Written By: Updated August 17, 2022 If your microwave fan turns on when the door opens, you likely worry about an inherent safety issue. However, a faulty switch in the door frequently causes this problem. This may also be an issue with arcing, which is what makes a crackling noise in a microwave at times. This switch tells when the door is opened or closed, turning on and off the best microwave. KEY TAKEAWAYS:
To avoid these interlock issues, you may want to check or replace your door switch as described below. If this process does not help, you may need to reach out to your repair service. You may also be interested to know how to replace a microwave turntable motor and fix the turntable in the microwave for future fixes. Insider Tip Unplug the microwave before starting to protect yourself from electrocution or shock. Microwave Oven with a Running Fan and Door OpenThe primary issue that could affect when the fan turns on or off comes from the interlock switch. If this feature isn’t working right, the microwave doesn’t know that the door has been opened or closed. You should try resetting the power at the circuit breaker first to get a better idea of the issue. Unfortunately, this issue is relatively common and can result from a faulty switch or a sticky switch. On the other hand, if it’s from a delayed switch, your microwave will eventually react to the door being open. Therefore, you may also want to know how to replace a microwave door.
Warning You probably will need multiple screwdriver heads, so you should check if anyone in your house has a screwdriver with replaceable bits. F.A.Q.S Why does my microwave fan turn on when I open the door? If your fan turns on when you open the door, your door switch may be stuck or not working. However, sometimes other issues cause this problem, so it may take longer to troubleshoot. What do you do if your microwave fan won’t turn off? Keep the door closed when you aren’t using it. If you want to try fixing the door switch, you can find the instructions above. However, you may end up calling a service shop. Will operating a microwave oven while empty damage the equipment? You should never run a microwave without anything inside, because doing so may damage the microwave and cause issues during use. STAT: If the door continues to run even when you open the door, then it is likely a door interlock switch fault. (source) REFERENCES:
Alexis has been writing since she can remember and has studied writing extensively in college. She has written for both the University of Wisconsin–Whitewater Undergraduate Research Program and GE Healthcare. Why does my microwave fan come on by itself?This is normal. The microwave oven's cooling fan (on some models), which is separate from the vent fan, automatically comes on during microwave oven operation to cool the microwave oven. It may also automatically come on and cycle on and off to cool the microwave oven's controls while the cooktop below is being used.
Why won't my microwave fan shut off?Faulty air filters
Sometimes the air filters get clogged. The air filters are important as they absorb dirt and dust and prevent them from getting inside the machine. Over time, dirt and dust can build up inside air filters, resulting in a blockage. Check the air filters if your microwave vent fan won't turn off.
Why does my microwave fan turn on when I close the door?If your microwave turns on by itself after you close the door you may need to clean the door, check the latch, or ensure that the door is closed all the way. But if your cooktop lamp will not turn off, then it may just be wet from recent cooking. Follow this guide to get things back to normal.
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