Question about Microwave Ovens

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

Micro has loud hum when door is closed. Error code "PF" (power failure) displayed. No operation.

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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.

Posted on Nov 08, 2014

Testimonial: "Yes, Thanks! I have, however, subsequently tested? the switches, HV diode, HV capacitor, magnetron and last, but not least, the HV transformer. All check out except the transformer, as I get a resistance of 122? when touching leads to HV filament and HV transformer chassis. I believe this is way too high a value, no??"

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  • Glenn Russell
    Glenn Russell Nov 08, 2014

    When servicing the what??????

  • Glenn Russell
    Glenn Russell Nov 08, 2014

    High Voltage Capacitor?

  • Chris Llewellyn
    Chris Llewellyn Nov 08, 2014

    The "the" at the end of the sentence shouldn't be there. The high voltage capacitor and the magnetron both can put a serious hurt on you. The problem may be in the power supply that powers these two components.

  • Chris Llewellyn
    Chris Llewellyn Nov 10, 2014

    Don't have the specs for that - but for a transformer it does seem to be a high value.

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Sharp R-9H84B-display black, cleared display shows "Conv Mix, 88:88 Auto". Short time all dark again. Hit clear happen 2 times then, all dark, no power, can't clear won't start, nothing works.


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1 Answer

Is light supposed to come on when door is opened?


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!

Nov 08, 2014 | Microwave Ovens

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How to fix loud hum and no heating in Sharp model R-308KW?


Hi,
There could be a variety of reasons why this happens, but the likeliest
reason is the secondary interlock or monitor switch is broken. These are micro switches that tell the microwave that the door is closed. If this switch is broken, then the microwave thinks the door is still open and the carousel table won't turn, and the oven will not heat up.
I replaced an interlock switch last Saturday. The switch was $7.00 and took me an hour.
Ask your local repair person to test the interlock and monitor switches first, then go from there.
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Emerson Microwave MW9325SL hums when door is closed


You probably have a bad door switch, and maybe a secondary problem. I recommend it be checked.

Apr 09, 2012 | Microwave Ovens

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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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My spacemaker just stopped heating food. What do


This is a microwave, correct?

I suspect the door lock interface switch(es) are burned out. Unplug it, be mindful of the 25,000 volts in the silver thing. Check the micro switches (look where the door closes on the top right side, probably) two positions, normally open or normally closed. check them for proper operation.

Micro switches are the most common of microwave failures because most of us open the door while the machine is running causing arc at the switch and burning up the little contacts.

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Displays F6 error code, hums when you start it and the tray circulates when you open the door


Depending upon which make and model you have, F6 is the code for either relay failure or shorted tempurature probe.

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1 Answer

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


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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.
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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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Microwave made a loud pop,won't heat,sounds like it's only on half power, makes a low intermittent hum


This is almost certainly a blown high voltage diode.

Please reply back with your brand and model number so we can help you.

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