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Original problem was a F2 error code: beeping, locking, starting and running when no one was home, etc. Only way to clear was to trip the breaker. Procrastination in fixing has lead to a new set of problems: no longer beeps or runs on its own, but now it will run (on command), but not heat, and it makes a low rumbling sound like a motor is not getting proper power. Same problem?
Can replace the control panel for around 100, but the brain looks to be another 150, and neither of those sounds like a fix for the low rumble. Any help? Thanks!
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Rank: Advanced Member
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Joined: 8/16/2007(UTC)
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That growling sound is a bad High-Voltage transformer (very possibly caused by low input voltage). You can confirm this by disconnecting the lead from the transformer that goes to the capacitor/diode. Set the microwave on a cook cycle, and see if the transformer is receiving 120VAC fron the control board. If not, replace the control board. (The touch pad is probably still good).
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Rank: Member
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Originally Posted by: magician59  That growling sound is a bad High-Voltage transformer (very possibly caused by low input voltage). You can confirm this by disconnecting the lead from the transformer that goes to the capacitor/diode. Set the microwave on a cook cycle, and see if the transformer is receiving 120VAC fron the control board. If not, replace the control board. (The touch pad is probably still good). Thank you for the quick advice. That is all a bit over my head as I was unable to even locate the HV-Transformer. I will probably schedule a service call, but I am curious: the fact that the unit is not heating is likely a result of the low input voltage - yes?, which is also causing the rumble. The original (long time) problem was the F2 error, but the unit still worked. Would the control board have progressed to this state? Just trying to decide if I need to spend the money on a service call at all - maybe just replace the board now? Thanks again-
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Rank: Advanced Member
Groups: Senior Expert
Joined: 8/16/2007(UTC)
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If the transformer was receiving low voltage over a prolonged time, it can possibly be damaged. The only way to know for sure is a complete diagnosis. Don't think you have failed, just because you need a pro to do the job: Microwaves are simple by nature of their similarities (brand to brand); but they are among the most complicated appliances a D-I-Yer can fix.
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Rank: Member
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Ordered and received the new board, powered down and installed new component. Pretty straight forward - then when I tried to power back up, Nothing. No power, no lights, groans, beeps, sparks - nothing.
Put old board back in to rule out the obvious, again No Power.
What am I missing here? Is there a reset or something?
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Rank: Advanced Member
Groups: Senior Expert
Joined: 8/16/2007(UTC)
Posts: 3,273
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Did you check the fuse just inside, where the power cord comes in?
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