Question about Maytag MMC5000 Microwave Oven

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Coffee Exploded and now unit just hums.

Yesterday I think I pressed a couple to many zeros on the timer and blew up a cup of coffee. I heard a two loud pops, one from the mircowave and one when the circuit breaker tripped. After drying out the inside, I figured I'd let it dry over night before plugging it back in. Now when I plug it in it hums like it is running. However, the lights nor control panel are funtioning. Sounds like a short to me. Is this worth calling in someone to repair it? It is three years old.

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Re: Coffee Exploded and now unit just hums.

If it hums like it's trying to run when you just plug it in but you have not pressed any keys to initiate cooking, then that problem is almost certain to be related to the control panel. Probably what happened is the steam got onto the circuit board. You may find that it has a coating of residue which is shorting out the unit. That can usually be cleaned and any damage corrected. We do that sort of repair for 32.50 nationwide. If it is not cleaned within a few weeks, it can corrode connections and make the damage worse. In some cases the keypad is affected but not the board. If either needs to be replaced, both are available. You can part prices by entering your complete model number here: It is also possilbe that in addition you have a problem in the high voltage section. At that same site, you can find exploded view diagrams to help you look over the unit to see if there is any damage to the high voltage transformer or the high voltage rectifier diode. Those parts are reference number 5 and 8 respectively on the diagram for model number MMC5000ADB and I suspect they're the same on yours. Be sure it remians unplugged if you open the unit.

Posted on Dec 19, 2006

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