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I think compared to the replacement cost of the complete combo you will find the microwave repair cost reasonable.
Unless additional ventilation is provided to the rear and sides of your built in combo, a lack of circulating cooling air could have been at least part of the reason why your microwave failed - the electronics need lots of air circulation.
You might want to address this while the unit is removed for repair.
The voltages inside a microwave are potentially lethal and so the checking and repair is a specialised task...
If everything else is working fine, the magnetron is the likely problem, "heats food and is the heart of the microwave oven" if more than five years old cheaper to replace the whole item.
Are you getting 110VAC on the primary leads of the high voltage transformer when you press "Start" to begin cooking?
If not, yhen it may simply be a bad cook relay (I do board repair) or a bad bottom or inside top door switch. See http://www.microwavecontrol.com/doorsw.htm
E-mail me via my site for more free help.
William E. Miller, AS-EET [email protected] http://www.microwavecontrol.com Microwave Oven Control Panel Repair Nationwide "Recycling by repairing since 1982"
Intermittent operation can be caused by a door interlock micro switch, a weak capacitor, an intermittent wiring connection from heat or poor connection, a marginally performing diode or a sticking Magnetron. Except for the Magnetron all other repairs would be worth the expense.
Repair costs and parts for most everything else will be between $65 and $100.00 depending on the part(s) replaced. Replacing the Magnetron would cost more than 50 % of the total unit replacement cost.
Sounds like the magnetron has failed. It is the magnetron that generates the microwaves that heat the food. If it or the circuit that powers it fails then it stops heating. There are some high voltage circuits that feed the magnetron and you can potentially get hurt if you don't know what you are doing. Would recommend you have it serviced by a professional if you want it fixed, otherwise look for a new one since the cost of repair can come close to the price of a new microwave oven.
you may have gotten a power surge and that can cause some funny things to happen, 1st is there power to the oven, 2nd if so there may be an internal fuse protector built in to the oven, check with the manual for anything of that sort listed. if not you may have to take it in and have it repaired by a pro. there is a lot of voltage in these ovens and unless you know what you are doing a person could get hurt
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