Question about KitchenAid KHMS155LSS 1000 Watts Microwave Oven

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No power to oven

No power...plugs fine. Dead as Elvis.

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  • 9,042 Answers

A microwave can be dead for many reasons.

It may be the fuse, which is usually located behind the grille, on the floor of the oven behind the control panel, between the door switches, or on the filter board near where the cord comes into the unit.

If the fuse is good, it may be an open thermostat or thermal cutout (TCO) / thermal fuse on or near the magnetron or on top of the cavity / body of the oven.

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.

When checking TCOs or thermostats, if it has a hood fan thermostat, that should read open, as opposed to the others, which should read closed.

So don't let that fool you.

If the cavity thermostat needs to be checked or replaced you'll need to pull the oven from the wall.

If so, the installation instructions are very handy, and it's best to have two people since the microwave can be heavy and awkward.

You can download Kitchenaid / Whirlpool owner's manuals and installation instructions here.

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 (or GFI) 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 it's intermittent or random, it may be a bad connection, usually on the control board or a loose fuse holder, or even an intermittent fuse.

You should do a continuity test on the fuse while it's in the holder (with the microwave unplugged, of course) then turn the fuse by hand or take it out and put it back in, then test it again.

If you remove the fuse, then press the meter leads against the ends, it can allow internal contact to be made and make a bad fuse appear to be good.

If you or someone you know 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.

There should also be a "mini-manual" hidden inside the unit behind the control panel or hidden on the left side behind the grille, which is very helpful when troubleshooting & testing.

If you don't find yours, or if you want to look at it without disassembling the oven, you can download it here.

At our Web site, we have a video available showing how to remove a typical over the range control panel assembly in under 5 minutes.

If you'd want to replay back with your model number or scan and e-mail or copy and fax the mini-manual (or at least the "schematic diagram page) to me, I'd be happy to make more precise suggestions.

You can usually find helpful exploded view diagrams and order parts by entering your full model number here.

We're happy to help you with free advice and we'd appreciate your thoughtful rating of our answer.

Posted on Dec 25, 2008

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1 Answer

Unit was working than just shut down, the display went dead.


hello,

the solutionhas noting to do with reset button or code

what the problem is from the element (heat provider)it is always is silver colour all it means is there is disconnection from it or it is bad.

what you need to do to fix up your oven is to unscrew it and then trace down the wire to the heater (element) but if you did not see any sign of disconnection then you will have to make a change of the element it mean bad .

thank you and thanks for using fixya.

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This will require trouble shooting with power present and a qualified individual should do this. Verify power at the plug and trace to the board. It could be a bad wire, loose connection, open cavity thermostat, or a failed board assuming power is available and the fuse is good.
Eric

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No power everything was fine then nothing when i got home is there any fuses to check in the microwave


There is a fuse under the cover, as well as a couple of safety thermostats that can cause a dead oven. It may also be that the power transformer for the control circuit board has failed. I've seen several Sharp ovens where the transformer died because of power surges. This would cause no display and no functions even though the oven has power. Also, did you make sure the outlet your oven is plugged into has power? If it's a GFI outlet it may need to be reset, or a circuit breaker in your electric service panel may have tripped.

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There's really nothing user-serviceable in a microwave oven. Because of hazardous voltages inside and the possibility of microwave leakage, service should be left to professionals. Take the oven to a service shop for an estimate.

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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
thermostat to open.

When it cools, it closes the circuit and allows power through again.

If it's random, it may be a bad connection, usually on the control board or 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 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,
linked here on Fixya: http://tinyurl.com/yzjozk

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I do a lot of work on Dacors / Sharps. Can you describe what you mean by "shutting off"? When it was shutting off before, was it completely dead with no display and no beeps? Was iut shutting off during a cook cycle or just while setting there or what? When it would come back on or start working again, how long did it take to come back, or how did you make it come back on?

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