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Is light supposed to come on when door is opened?

Micro buzzes or hums when door is closed. no operation - error code "PF."

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Yes the light comes on when the door is opened and when the microwave is active! The PF code indicates a Power Failure, press clear or cancel to reset or unplug for a few minutes and re plug!

Posted on Nov 08, 2014

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Posted on Jan 02, 2017

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My GE Microwave Model JKP90SP4SS will not shut off, even with no time programmed and cooking is done. The only way to stop operation is to open the door or shut off the breaker.


This kind problem is usually associated with the door micro switches. What happens is the switches are supposed to prevent operation when the door is open and other things. When one fails, often the oven will run with the door open or closed. There are a number of these micro switches inside and they protect the user from certain unintended actions or combinations of actions. This usually happens with well used ovens. There are extremely dangerous voltages inside a microwave over, even when not connected to power. Find a tech who knows these things.

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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.


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 pupista@gmail.com and remind me of your full model number and symptoms.

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When microwave is started, why does it make a loud buzzing sound--like a Skil saw sounds?


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1 Answer

What is the first thing to test on my micro that is acting up?


Microwaves are not very user friendly when it comes to servicing the. They generate very high voltages and are very dangerous to try to repair without the proper training.

Nov 08, 2014 | Microwave Ovens

1 Answer

The microwave wont respond to the timer. It keeps cooking unless you open the door. After the timer runs out it seems like it cuts off but there is still a low buzzing sound and it is still cooking. Have...


low buzzing can be a power relay or a (solid-state)
triac which both supply power in their own right to the power transformer to operate the magnetron tube,even though you say it quits cooking when you open the door,i would still check the micro-switches in the door for proper alignment and operation, because it can be a door switch mis-alignment or a leaking triac still supplying power to the unit

Jul 14, 2010 | Kenmore Microwave Ovens

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Microwave buzz with door closed and off This is a GE JVM1443WR Spacesaver... Microwave works, all buttons work, interior light works, and it will heat food... However, even when the microwave is off and...


You can check the relay and related driving circuit. If there is a short in the relay driving circuit there is chance for this type of problem. or the micro processor may be defective.

May 23, 2009 | Microwave Ovens

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1800 XL JVM1860BD - won't work


It sounds like your controller may be failing. Or it could be an electrical line problem. Any other electrical itmes giving you trouble? Has anyone measured the voltage level of your power line? It should be around 110-125 volts AC. If it's significantly lower or higher, you may have a bad connection in your breaker panel or in the wiring leading to the home.

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1 Answer

My Microwave flickers and buzzes


This problem normaly happens when the door is not closed properly for a long time and flashing and buzzing starts to give user a indication for same. Allthough it is not risky as microwave oven has safty door switches wich does not allow oven to operate while door is open. Take care and close the door properly before you leave kitchen..

Aug 02, 2007 | Kenmore 66469 / 66462 / 66464 Microwave...

1 Answer

Microwave works with door open


If the top is open, the upper door switch should be open and the high voltage section should not be energized. That's the way it's *supposed* to work. But that buzzing is worrysome! Does the turntable turn during this condition? Does the inside light come on? How about the fan? If not, then I would doubt that it's cooking. If so, some models will do this. It's not uncommon to notice that the fan and light will try to come on for a split second when you shut the door. This would not indicate a problem. It has to do with the timing of the door switches and a replay on the board. If it's still under full warranty, it wouldn't hurt to call a GE-authorized servicer.

Nov 07, 2006 | LG LRMM1430 Microwave Oven

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