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Posted on Mar 12, 2008
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Micro. will not heat up.turn off at power point and it will work for a short while.

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William Miller

William Miller

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  • Microwave Ovens Master 9,179 Answers
  • Posted on Mar 16, 2008
William Miller
Microwave Ovens Master
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Generally, the most common causes of a failure to heat are:

- bad door switches or door switch mounts
- loose connection at the magnetron
- problem or loose connection on the control unit circuit board
- bad magnetron or other high voltage part (such as a shorted diode)

If you or someone you know decide to look into it, we have critical safety information, info on door switch diagnosis and replacement, 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

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

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Related Questions:

0helpful
1answer

RE: Samsung microwave SMH7187STG mfg'd 5/08. I heated cup of tea 2 min.Then I closed micro's door & micro emitted a continuous electrical buzzing sound.I opened door & buzzing stopped.
The cook relay on your control board is shorted, and the unit is cooking whenever you close the door.

When the magnetron overheats, its thermostat opens, shutting power down until the unit cools to a safe level, then power is restored.

I regularly repair these with my $54.95 service, which includes insured return shipping.

Details are here, or for full information and instructions, please e-mail me here at [email protected] and remind me of your full model number and symptoms.
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Dec 20, 2016 • Samsung Microwave Ovens
0helpful
1answer

Why would the turntable stop turning and the unit stop heating?
hi,
there is a micro switch that signals when the door is closed. this tells the machine that it's okay to start the turntable and heating process.. if the micro switch breaks or shorts out then the switch does not send the signal so the machine does not work.
hank
Read full answer
Sep 06, 2014 • Sharp R-1505 Microwave Oven
0helpful
1answer

Replaced the 20amp fuse in my microwave. Clock and all lights work but oven will not heat
one or more of the door micro switches are open or shorted..the micro switches tell the unit the door is closed and safe to use.the micro switched are marked normally open or closed..take note when replaceing them..also their is a actuator lever that tells the switch to close or open..it is plastic and connected to the door latch..it can be broken off or bent from heat,,its plastic..make sure its in place and working the micro switch
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Aug 15, 2014 • Microwave Ovens
0helpful
1answer

GE micro wave oven turn table won't work Model LVM1750DM1BB, #SM900740B
first:check AC chord.,
2nd:check fuse,f fuse open check big capacitor.
3rd:check heating element if shorted replace it....hope it can help.
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Sep 22, 2013 • GE Microwave Ovens
0helpful
1answer

Microwave light turns on and vent fan runs when door is closed. It heats fine and functions work fine. It is not heating or counting down when closed, just light and fan.
Hi,
You have a shorted door switch, not a difficult repair. You will need a micro switch and knowledge of microwave repair to replace this switch.
I hope this answered your question

I’m happy to help further over the phone at https://www.6ya.com/expert/gere_bf68e6055dd61249

Read full answer
Aug 05, 2011 • Microwave Ovens
0helpful
1answer

I need model WMS25EGSI to operate my microwave that does not heat
Classic Door Safety Interlock Switch failure. Remove the cover, check the micro switches with a ohm meter for proper operation. They should show 'short' when the door is closed and "open" when the door is open ... or the reverse of this depending on the method used by the manufacturer. Point being, the switches show one condition with the door open and the other condition with the door closed.

The oven needs to know the door is closed before it will turn on the heat. If the switches have failed, the oven thinks the door is open ... make sense?

Why do they fail? Because we all open the door while the oven is operating and this causes switch failure.

Thanks for your question @ FixYa.com
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Jun 21, 2011 • Microwave Ovens
0helpful
1answer

My microwave will run but it doesn't produce any heat... We have been having quite a few power bumps lately...
This is classic door safety interlock switch failure. Remove the cover and check the micro switches you will find near the latch. If they are failed, the oven can't tell if the door is closed ... door not closed, the oven will not turn on the heat.

If the switches check out ... it could be the capacitor ... you can't and shouldn't test this beyond removing and reinstalling the leads. The capacitor stores a LOT of power and can be lethal. Shorting the device out can be dangerous. Proceed at your own risk.
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Oct 06, 2010 • Whirlpool Microwave Ovens
2helpful
1answer

Emerson microwave mw8773sl has no power, no lights
Make sure that a lamp will work in the outlet powering the microwave. If ok, remove the case (with the plug pulled), and look for a tripped breaker or blown fuse. If found, check for a shorted high voltage diode in the magnetron power supply. It may also have a shorted stirrer bearing located above or beside the cavity where the microwaves come into it. The stirrer is a metal fan-like device that scatters the microwaves to get more even heating and has a plastic bearing that arcs internally causing a microwave short. Replace the stirrer unit.
If no fuse or breaker troubles, look for faulty or loose micro-switches around the door latch mechanism.
Read full answer
Aug 23, 2009 • Microwave Ovens
1helpful
1answer

Boiling waer under micro wave lots of steam into micro wave, turn on micro wave ,pop noise like glass miro wave comes on louder hum than normal no heat
Q - The microwave display counts down and the inside light is on,  but nothing is heating and the fan is not running.
A - This most commonly is a bad door switch, other possible problems are a faulty relay or solder joint on the power module, but a bad door switch is most common.
 Q - My microwave is running and sounds like it is working but will not heat up anything.
A - Many thing can do this but, common things are....loose high voltage wire.....poor solder joint on board.....magnetron.....power relay.....
Q - The microwave makes a loud "hum or buzz" noise but will not heat up the food?
A - 9 times out of 10 this is usually this is a bad magnetron, the other time is sometimes a bad high voltage diode. See components section.
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Mar 03, 2009 • Amana Radarange Microwave Oven
3helpful
1answer

Micro turns on but doesnot heat also turn on by self
Hello bbmasonjim,
If your micro turns on ( meaning everything seems to be working from the control panel) and you aren't getting microwave energy to heat food..you may have any number of damaged or defective components : Magnetron Tube, Filament Power Supply or HV Capacitor.. None of which are something the untrained person should mess with. Even unplugged, there is High Voltage potential inside the electronics compartment. If it is less than a year old, it may still be under warranty.. otherwise.. the cost to repair would probably be higher than the cost to replace..

Regards,
Rick
Read full answer
Dec 13, 2008 • LG LRM1250 Microwave Oven
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RE: Samsung microwave SMH7187STG mfg'd 5/08. I heated cup of tea 2 min.Then I closed micro's door & micro emitted a continuous electrical buzzing sound.I opened door & buzzing stopped.

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