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Re: Microwave Kenmore #721.80019401
This is usually caused by either a bad door switch, a loose door switch mount, or a problem on the control panel.
Even though a door switch clicks, it may still be bad inside. Its continuity must be checked.
Door switch or mount trouble can be caused by slamming the door or by opening the door while it's cooking without hitting the Stop pad first.
If you someone you know decide to look into it, we have critical information on safety, disassembly and door switches at our site, and our link is 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 here: http://www.searspartsdirect.com
If you think the problem is on the control panel, we repair these nationwide by mail for $39.95 postpaid in most cases.
Please write back with more details if you need further help.
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If the microwave oven is 10 years old then it is time to consider a new unit, by your description it is going into cascade failure where different parts have stopped working, the buzzing sound is the magnetron warning you, it is about to fail. The fans job is to keep the magnetron cool while it is running.
Your magnetron tube has failed. According to the warranty on the Profile Series microwave ovens, the magnetron is covered for 5 years from the date of purchase, but labor is not included. I would call GE Customer Service and when they ask for the model number (which begins with JVM) and the serial number, be sure to give the date of purchase as the date you closed on your house. If they insist upon charging you for a service call and labor, I would call my builder's Customer Service Department and demand (very nicely) that they intervene with GE to waive the service and labor charges. That worked for me (Lennar Homes).
Same thing happened to us. We just came back from Sears, where we bought another. Just for giggles, my wife suggested unplugging the old one and plugging it back in again. It works now. New one's going back to the store.
If you just purchased and Installed the microwave, I would call Sears and tell them what is happening, generally, it would still be under warranty if less than a year old. If its a countertop model, you may have to take it in, otherwise they should come to the home for the repair. I would also NOT indicate that you have looked at it as that would void your warranty. Otherwise, it seems like the problem could be, a) touchpad , b) a relay or c) the main control board