Question about Whirlpool MH7155XM Microwave Oven

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It just died

It just went dead and it is not the circuit breaker in the garage. I am wondering if it has an internal fuse that can be replaced?

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  • crandjh1 Oct 08, 2008

    The microwave ran for about 1 second after I pressed "start", then the GFI breaker blew. I reset the GFI and the outlet is live, but the microwave is still dead. No light on the screen, no response from the keypad.

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There should 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.

A microwave can be dead for many reasons.

It may be the fuse, which is usually located behind the grille or 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 TCOs or thermostats, if it has a hood fan thermostat, that should read open, as opposed to the others, which should read closed.

The TCOs you need to be concerned usually with have all black or white wires only. Please reply with photos of your interior if you have questions.

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.

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

Posted on Sep 25, 2008

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It just has no power. Nothing happened, I just went to use it and it was dead.


The main fuse is blown, "ceramic type" usually caused by a defective door switch.

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There is an internal fuse, however to access it the unit must come out. The outer case will need to be removed. The following link will take you to GE's website where you can get installation instructions. The fuse is available at ther parts site, but you can get a new on for less than a dollar at radio Shack. Take the fuse with you.
http://products.geappliances.com/ApplProducts/Dispatcher?REQUEST=SpecPage&Sku=JVM1665DNWW

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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. See: http://www.microwavedisplay.com/doorsw.txt in this case.

If this unit has an inverter some parts are difficult for the average do it yourselfer to replace, such as parts which are spot welded, not using removable connectors.

In such cases, it's best to replace the entire inverter.

Due to the lethal voltages used and produced in inverters, I do not recommend that an inexperienced person work on them.

You can find an authorized Panasonic servicer here.

In Canada, you can find an authorized Panasonic servicer here.

You can find an authorized Panasonic servicer here.

You can order Panasonic parts from
Encompass or by calling 866-779-5835.

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

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Possibly the internal fuse. Unplug unit, remove all case screws on the back of the micro. Slide the case toward the back and remove. Look for a glass tube type fuse, simular to automotive fuses of the past. It should be located near the controls. If bad, I have been able to find replacements at Radio Shack. If the fuse is good, I'm sorry, it's beyond my microwave knowledge level.

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Maybe. You can get a fuse here: http://www.amiparts.com//A33A673631FA4E01ABD536DEFEA76A01.asp?pcs_key=A31D300EB99A4D17A25D1D3529D26562

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Microwave went dead


Hi

If your microwave oven doesn't seem to work at all, check these: Fuses Usually, when your microwave oven doesn't work it all, the internal fuse (thermal fuse) is blown. This fuse protects both you and the oven. When it blows, you need to have a qualified appliance repair technician replace it.

Door switch If the fuse isn't the problem, check the door hooks and the door-release button. When these are broken, the door switch doesn't activate, so the oven can't work.


Please do rate the solution as FixYa and revert for further assistance.

Thanks
Rylee

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A microwave can be dead for many reasons.

It may be the fuse, which is usually located behind the grille or 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 oven thermal cutout (TCO) on the top of the oven cavity / body or an open thermal fuse on or above the magnetron.

These should read closed (virtually zero) on a continuity check.

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 went dead or when you plugged it in or opened or closed 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.

You can usually find exploded views and order parts by entering your model number here at the Sears parts site but the best place to order Sharp parts is Tritronics.

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

Oct 12, 2008 | Microwave Ovens

1 Answer

Complete Shut-Down


I woulds first suspect a blown internal fuse or a thermal cutout on the magnetron in your case, but a microwave can be dead for many reasons.

If it goes dead for just 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 on again.

If it's intermittent or 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

Please write back with more details if you need further help.

We appreciate your thoughtful rating of our answer.

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