I was cooking with the microwave vent on. When I no longer needed it on, I pushed the button to turn it off. The indicator on the microwave turned off, but the vent stayed on. I tried several times and it just stayed on. I unplugged it for a few minutes. When I plugged it back in, the fan came on again! How do I fix this?
Unplug it for 12 hours or more and try again. Failing that the button or circuit for it may be broken, also make sure nothing is blocking the vent or nothing in the vent assembly is damaged. if you are opening the microwave make sure you know what you are doing of get a pro to do it for you. get an estimate and compare that to the price of a new one. Especially if the microwave is old or cheap.
SOURCE: Kenmore over the counter microwave problem
It has a bad relay on the control board. The board will need to be replaced.
SOURCE: Emerson microwave, #MW8119SB, push start button to start cooking
Replace the fuse with a ceramic fuse from Home depot! costs less than $3 and it will fix the problem. I had all the same problems as everyone else, you name it my microwave had it! you must remember replace it with a ceramic fuse! not a glass one. I know people say its the switchboard and all that nonsence but I promise you, the fuse plays a majoe roll in the microwave not working properly. Even though it doesnt look broken, a junky fuse can cause your appliance to do very strange things. I replaced mine 6 months ago and it works like its fresh out of the box.
SOURCE: Tappan TMV151FS over range microwave starts to work and then dies
Never run the microwave without a load (something to heat)!!! That kills the microwave generating parts.
Sounds like a 'thermal' protect switch is activating after running. Make sure that (if the unit is mounted in a cabinet) that there is sufficient space around the unit for proper air flow and that nothing is blocking the vents. Try setting it on a counter top and heat something. If it works properly and doesn't shut off, the venting space is the problem. You may have to have the cabinet that it sits in redesigned for more clearance.
SOURCE: Microwave vent turned on by itself and won't turn off
The HMV9305 has an automatic vent turn-on feature. It senses heat, possibly from the oven or range beneath, and turns on the exhaust fan until temps return to normal. Sometimes this may take 4-5 minutes, which can seem like an eternity of listening to the blower run, but it is a safety feature designed to prevent damage to the microwave from excessive heat generated by the cooktop or oven beneath it.
SOURCE: Whirlpool MH7140XFQ-1 microwave no longer heating
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Microwave Oven Basic Troubleshooting Tips
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