Buzzing uncommon in my experience when in theory the appliance should be switched off.
I would want the peace of mind of knowing the cause of the noise.
It is worth noting the fan of some of the more hi-tech models is automatic and will continue running for a while to keep the electronics cool after the cooking is complete...
The buzzing is quite common in microwave ovens.
SOURCE: GE JVM1660 1000 Watts Microwave Oven beeps every minute
Maybe u should contact ur retailer or the manufacture helpline and tell them your problem they might be able to tell what's wrong.
SOURCE: Microwave won't work
F6 usually means a fault in the controller or keypad. You could try to unplug it for several minutes, then plug it back in. If it still fails, maybe you or a friend can disconnect the power cord, unplug the keypad strip internally, then plug the power cord back in and try it with the keypad still disconnected. If it does not fail again, you have a wet or shorted keypad and can dry it or order one. If it does fail again, the control board is bad. If you or a friend decide to work on it, we have *critical* safety, disassembly, and troubleshooting info at our site, which is linked at our listing here on FixYa: http://tinyurl.com/yzjozk You can find helpful exploded view diagrams and order parts by entering your full model number (without the suffix) here: http://tinyurl.com/gv383 Sorry I didn't get to answer this before the bogus answer was posted. I've been tied up and away from the PC.
SOURCE: Buzzing noise, wont work???
The magnatron is shorting, overloading the high voltage transformer. From the picture this looks like an older unit and is probably not worth a magnatron replacement.
SOURCE: Microwave oven stays on continuously and won't heat food.
Spacemakers have had problems with there magnatron, part is around 170.00. Depending on the year it is covered under a warranty however the labor is not. I have replaced 3 spacesavers for people already due to this issue. Unit runs but will not heat.
SOURCE: Microwave buzz with door closed and off
You can check the relay and related driving circuit. If there is a short in the relay driving circuit there is chance for this type of problem. or the micro processor may be defective.
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