I have a Kenmore over the counter Microwave Model # 66561629100. It started making a loud humming noise and stopped heating. I unplugged the transformer and no more Humming. It still does not heat what should I do?

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Aug 12, 2011 - 10 posts - ‎2 authors
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Usually that is a sign that your magnetron tube has gone bad (shorted out).

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Good possibility your start capacitor is leaking. When it goes completely it will blow fuse or circuit breaker causing a dead condition. You can get and replace this yourself but be careful to discharge the capacitor with a set of test leads across the terminals. This part can hold dangerous voltage! Of course, unplug the unit first. The magnetron is expensive if you can even get one. For the cost of most new units, this may be too much unless it’s a over the stove model.

Disconnect the HV transformer leads from the magnetron and the capacitor. Make sure none of the wires are touching the chasis or other parts. If the loud humming sound is still present, it is the High Voltage transformer making the noise. If the noise goes away, it is the High Voltage Capacitor going bad.

*MAKE SURE TO UNPLUG UNIT BEFORE TOUCHING ANY OF THE HIGH VOLTAGE LEADS! ALSO, DISCHARGE THE CAPACITOR BY SHORTING THE TWO SIDES AGAINST EACH OTHER!

hi it could be a bad neutral connection on your plug or inside on your high voltage transformer check the plug for burning and try plugging it in a different socket

Loud hum is usually due to faulty hv diod, resonance capacitor, or the magnatrone feed thru capacitor , chk it with a ohm meter , one by one n replace it .. zaheer Islamabad

you have done well out of the oven . it sounds that certain components are well worn and probably no able to get parts best advice it time to buy a new one

yes for sure magnetron or diode has gone bad.but usually it is the mag.magnetron when go bad they start making noise and stop heating.when chaging magnetron chg the diode with it.

humming sound is your magneto going out Dont have any idea of the cost for replacement however it may be cheaper to purchase another microwave than to repair this one. Good Luck

Dave

hello Frank. Sorry to tell you that the magnetron is going bad and making that terrible noise. Since the inside of a microwave, even unplugged has up to 2000 residual and deadly volts of electricity I recommend either calling a pro or replacing the unit.