Question about Kenmore Microwave Ovens

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My microwave is completely dead, nothing works, power surge. i just ordered a new control panel, fuse is good. to me it's worth taking a fifthy six dollar guess, part hasn't arrived yet.

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  • Kenmore Master
  • 9,047 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.

If it went dead almost immediately after pressing the Start pad, that's usually a shorted high-voltage capacitor.

If it went dead several 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.

There should be a "mini-manual" (tech sheet) hidden inside the unit behind the control panel or hidden on the left side behind the grille, which is very helpful when troubleshooting, testing, and locating components.

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.

Also, we do control circuit board repairs for $39.95 in most cases, and usually it;s only $25 more when we have to replace the low voltage transformer due to a surge.

So if your board was only $56, and your board was bad, it was an economical decision.

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

Posted on Aug 23, 2010

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The magnetron can overheat if the internal cooling fan fails, when you run it empty, when you run it a long time, or when you cook low-moisture foods like popcorn, bacon, or baked potatoes.

When the magnetron overheats past a certain point, its thermal protection device will kill power to the whole unit.

If the protection device is a thermal cutout, it will need a new thermal cutout.

If the protection device is a thermostat, it should reset after the oven cools down. If not, it will need a new thermostat.

You or someone you know can check this.

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

There should be a "mini-manual" (tech sheet) hidden inside the unit behind the control panel or hidden on the left side behind the grille, which is very helpful when troubleshooting, testing, and locating components. I've attached a marked excerpt.

In this model, the other parts which can commonly fail and render the oven "dead" are the 20A line fuse, and one of the cavity thermostats.

You can order parts from the Pros here. Just enter your full model number to do a lookup.

- William E. Miller, AS-EET
pupista@gmail.com
http://www.MicrowaveControl.com
Microwave Oven Control Panel Repair Nationwide
"Recycling by repairing since 1982"
mhe14xmq1_parts_layout_dead-bamrfjjfhaycgefspgj211on-2-0.jpg

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Model MX6110XB. Nothing worked. LCD panel was dead. Unplugged and replugged; and everything works.

This fix described for the GE Spacemaker. They say problem result of a power surge. Apparently applies to different manufacturers; or does GE make Whirlpools?

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1 Answer

Kenmore over the range microwave quit working 665.61639100


My bet is that the unit overheated and the magnetron is equipped with a thermal cutout (TCO or thermal fuse) and it blew,
protecting the magnetron.

If it runs dry, it will overheat.

But a microwave can be dead for many reasons.

It may be the fuse, which is usually located on the floor of the oven behind the control panel or between the door switches.

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

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.

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

If you do end up needing to take it down from the wall, you can download GE owner's manuals and installation instructions here.

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

Jul 27, 2008 | Microwave Ovens

1 Answer

Kenmore 665.61639100 quit working


A microwave can be dead for many reasons.

It may be the fuse, which is usually located on the floor of the oven behind the control panel or between the door switches.

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

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.

You can probably find exploded views and order parts by entering your model number here at the Sears parts site.

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

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1 Answer

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check mains fuse and check control circuit and magnetron. and diodes capacitor  high voltage related circuit. small part also gone microwaveoven doesnot works, first check oven and conform which part was spoiled, after that this is worth or not old ovens good compaare to new ones...

Oct 25, 2007 | Panasonic NN-T888S Convection/Microwave...

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Possible power surge?


Sounds like you got a surge which damaged the control panel. This is the most likely thing. We regularly repair these control panels nationwide for $32.50. A fuse is designed protect against excessive current. But if you have excessive voltage (a surge or spike), it can be so fast that it gets past the fuse and damages the control panel without actually blowing it. While the panel does have surge protection to keep that surge from actually destroying the control panel, the panel is damaged and will have to be repaired. If any power line connections were broken or are suspect, I hope you have contacted the power company. Either way, I would test any affected outlets to be sure the neutral and ground are present so the voltage output is within the proper range.

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