We put this microwave/microhood in a brand new rental house less than 2 years ago. The renter now states that it just stopped working. Nothing comes on, the clock doesn't work, ??? They also state they did not hear any funny noises or popping sounds before it went bad. They also say that there hasn't been a light bulb in it for some time but it worked fine without it.
Please help, I don't really want to spend another $300 on a new one!
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Microwave Ovens Master
Re: Whirlpool MH1170XMB over range MICROWAVE - DEAD
A microwave can be dead for many reasons.
If it goes dead for a while during or after cooking then comes back on, the magnetron is probably overheating and causing the magnetron thermostat to open. Then when it cools, it closes the circuit and allows power through again.
If it's intermittent or random, it may be a bad connection, usually on the control board or a loose fuse holder.
If it went dead almost immediately after pressing the Start pad, that's usually a shorted high-voltage capacitor.
If it went dead a few seconds after pressing the Start pad, that's usually a failing high-voltage transformer.
If it goes dead or blows the breaker when you plug it in or open or close the door, then there's a problem with a door switch or door switch mount.
If the fuse is good, it may be an open thermostat or thermal cutout on or near the magnetron or on top of the cavity / body of the oven.
If you or a friend decide to look into it, we have critical safety information and disassembly information at our site, and our link is at our listing here on FixYa: http://tinyurl.com/yzjozk
You can usually find helpful exploded view diagrams and order parts by entering your full model number here: http://tinyurl.com/gv383
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Aug 12, 2011 - 10 posts - 2 authors
My Whirlpool MT4155SPS-2 microwave oven has recently started to buzz loudlywhen operated. The sound is getting louder and more frequent ...
Whirlpool making intermittent loud buzzing noise Microwave ...
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Over the range ovens of all brands are prone to failure of the electronics due to heat and steam from the food that's cooked on the range below them. It's not extremely common, but you do see more of these types of failures on these as opposed to counter top models.
normally it should blow the units internal fuse first if its an internal issue, first check the line cord thoroughly for any bare wires at the case , then remove outer case asn see if cord is bare anywhere inside, then inspect unit fuse, take a multimeter and take a resistance check in an upper range og the meter of the disconnected h.v. diode, then disconnect h.v. capacitor(DISCHARGE) across terminals before touching and check this part, then lastly it could be the magnetron tube, or the hi voltage transformer, therse are VERY expensive items,you may vie to replace microwave then
Hi Adam, Built in over the range? The models change so rapidly unless it is less than a year old there probably wont be an identical replacement, Fortunately the mounting brackets remain close if you stay in the same brand. Whirlpools can be purchased at almost any retailer like Lowe's, Sears, BestBuy etc. Measure the the original and look for one that fits that dimension. Eric
Sounds like the magnetron has failed. 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.
First, there is an outlet. Plug in something else. Inside the key panel, there are fuses and a thermo sensor. Either may be bad. The thermosensor is about the diameter of a dime, black and 3/8 inch thick...attached to the wall of the chamber. All should have continuity.
"Microhood" seems to be a slang term for the "microwave hood" (hood fan or exhaust fan) which is normally part of an over-the-range microwave oven or range.
But these should be available separately, as I seem to recall.
I would contact home centers such as Lowe's, Home Depot (if they still exist), etc., or a local appliance store.