Question about Microwave Ovens

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Microwave oven shutdown by itself, outlet has power

One year and half old microwave suddently shutdown by itself. The outlet of plug is fine. What is the problem?

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  • Microwave Ovens Master
  • 9,042 Answers

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.

If yours is not there, Please reply back with your brand and model number so we can help you.

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

Posted on Oct 08, 2008

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Sharp Carousel Microwave Mdl 1875 for our RV is dead


>> We also tried plugging our toaster into the microwave plug outlet, and the toaster wouldn't work in that outlet, but worked just fine in a different outlet in the RV.

This means the outlet you plug your microwave into needs to be fixed in addition to fixing the oven. Breaker? Fuse?

>> I understand from another RV forum that microwave ovens for RVs have "special circuitry and cooling features" not found in regular countertop ovens for household use.

Not really in my experience. Any microwave supplied with clean AC power and proper venting space will be fine.

But I'd bet your microwave can be fixed affordably.

The main internal things which can result in this model being dead (no display, no light when you open the door, no beep when you press a pad on the keypad) would be the 20A fuse and the magnetron temperature fuse. There could also be bad connections on the noise filter board.

Also, sometimes a power surge can cause the power to be interrupted to the low voltage transformer on the board, and I regularly repair those boards. I can also write a technical statement to your insurance company or to an RV park as needed.

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.

The relevant service manuals for this model are here and here.

You can order Sharp parts from Sears or Encompass.

Contact me directly if you need more help.

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

Mar 08, 2017 | Sharp R1875: Over the Range Convection...

1 Answer

No power to microwave


Hello

Check the Power Cord

Verify that the power cord is properly connected the outlet; the plug might have been removed to make way for another appliance. Do not connect the microwave to an outlet via an extension cord or plug adapter; the oven must be directly connected to an outlet.
Switch the Outlet on

Turn the outlet on, if possible, using the switch on the wall behind the counter or on the plug itself. Some microwaves have a separate power switch that must be in the correct position before you can begin cooking.
Reset the Oven

Unplug the oven, wait a few seconds and reconnect the power. A power surge could have temporarily rendered the oven inoperable. The oven should start up as normal when you connect the plug to the outlet.
Check the Fuses and Breakers

See that the fuse or breaker protecting the oven's circuit is still active. Replace the fuse if it has blown, or reset the breaker to restore power to the oven. Stop using the microwave if it repeatedly blows fuses or trips breakers.

Oct 04, 2011 | Microwave Ovens

1 Answer

The microwave had been working fine we now have no power at all


Hi,
Here is a tip that will help you to figure out what is wrong with your Microwave Oven....

Microwave Oven Basic Troubleshooting Tips
http://www.fixya.com/support/r5508031-microwave_oven_basic_troubleshooting

heatman101

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1 Answer

When i plog it in it eother does nothing, or


I just bought the same microwave, and mine is doing the same thing. Did you ever figure out if it was the oven or the outlet? My old microwave works just fine.

Nov 26, 2009 | Bosch HMV9305 Microwave Oven

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My kenmore ELITE 721.64282 microwave/convection just stopped


I just had the exact same problem. :( Did you find anything out?

May 23, 2009 | Kenmore 63792 Microwave Oven

1 Answer

Microwave has no power


HELLO I BELEIVE THAT YOU HAVE A BLOWN FUSE, OPEN THE MICROWAVE AND LOOK FOR A WHITE FUSE, NORMALLY IS ABOUT 250V/15A TRY TO GET THE SAME ONE AT RADIO SHACK

GOOD LUCK

CAYPIANAN@YAHOO.COM

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heating element burned up if under warranty recommend replacement G.E. has always been good with there warranties or replacments

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Are you using a 3 pronged outlet and is it grounded? If you have a 2 holed outlet and are using a ground eliminator adapter, try turning the plug around to reverse the polarity. If this helps, then it would be advisable to have an electrician to ground your oven.

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