Question about Microwave Ovens

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Microwave runs and then stops, power is good.

The Microwave will run for three to four minutes and then stops, screen is blank. Power source is good, no breaker tripped. The microwave will come back on line in about four to five minutes with the showing 1:00.

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  • stevemo Jul 14, 2008

    Ran the microwave on the lowest setting for over twelve (12) minutes and it worked fine.



    Additional question. When I set up the microwave for install I set it up for vertical exhaust. I left the charcoal filter in place could this be the problem and will it effect anything if I remove the charcoal filter. The install direction aren't clear.

  • William Miller
    William Miller May 11, 2010

    It may be overheating.

    I would suggest cooking on the lowest power level and see if it runs any longer.

    Please let us know how it goes.


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  • Microwave Ovens Master
  • 8,820 Answers

Your test demonstrates to me that the magnetron is overheating.

This overheating can be due to the internal cooling fan's not running, a blockage in the air ducts, or just a bad magnetron.

(When I speak of the internal cooling fan, I do not mean the hood / exhaust / vent fan located behind the grille across the top.)

You'd have to consult your manual as to whether the charcoal filter should be used and how and whether it affects cooling.

Also, the charcoal filter cannot be cleaned,. It must be replaced when dirty or at intervals suggested by your manual.

If you do not have your owner's manual, please reply back with your brand and model number so we can help you.

Please reply back here if you still need help.

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

Posted on Jul 14, 2008

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My microwave shuts off, black no power when ever I cook tv dinners, potatoes etc. after 2.5 or 3 minutes. After 10 minutes or so, power comes back on and it displays PF. lots of steam inside after.


Hi Kerry,
"PF" is power falure if you didn't aready know this. It sounds to me like the coolig fan might be running slow or there is blocked or restricted air flow through the unit. This cooling fan is only for the HV transformer and magnetron. Sometimes you may get air flow around the door but this is incidental. The PF tells me that the power is being interrupted either at the power source (wall outlet or circuit breaker) or the magnetron TCO is cutting out. It also could be a bad magnetron running too hot. As far as the steam goes, I usually just leave the door open on my microwave for 10 or 15 minutes to let the condensation evaporate.

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Make sure that the program controller is working if not check power - step down supply, the pads are responding- if not faulty pads- or the door switches, if the switch contact are not good then it will not trigger the processor to switch on the waveguides. If the lights or fan work without any display or action of program being triggered to start then it can be a possible fault on the main board or the processor. Sometimes insect secretion can short the board and display panel and so the processor can work in such an erratic manner. If so clean, solder and reset the board. Now identify the parts by clicking this link: http://www.espares.co.uk/advice/microwave/a/5/141/identifying-microwave-parts.html

If there is no heating please do not switch on unless you have confirmed the fault. It is possible that the Magnetron is faulty, the temperature cut off is faulty or the main capacitor is short. It is also quite possible that insect can get into the oven and create soft spots. When you switch on these will create a short and make the voltage jump and in the long run damage the magnetron. Check this link to know how a microwave works:

http://www.espares.co.uk/advice/microwave/a/5/1443/how-a-microwave-oven-works.html

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Hello

Plug the microwave into the outlet if the microwave won't power up. Make sure the plugs on the microwave match the type of outlet. A four-pronged outlet can only be used with a four-pronged plug. Same with three-pronged outlets---they only work with three-pronged plugs.


Inspect the plug. Make sure it hasn't been cut or tampered with. Four-pronged plugs can't be cut down to fit a three-pronged outlet. Three-pronged plugs mustn't be forced into four-pronged outlets. A three-pronged plug mustn't be used in a two-pronged outlet, either.


Replace blown fuses, or if there's a circuit breaker, check it for tripped breakers. Sometimes the trip won't be obvious, so cycle the circuit breakers. Turn them all the way off and then back on again.


Plug another appliance in the outlet. You will find this easier with three-pronged appliances. Simply plug a toaster, or other appliance into the microwave's outlet, and see if it works. If it works, you know the problem is with the microwave, not the power circuit. Have the microwave serviced or replace it. If the toaster or other appliance doesn't turn on, you know the problem is with the circuit.

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1) Plug the microwave into the outlet if the microwave won't power up. Make sure the plugs on the microwave match the type of outlet. A four-pronged outlet can only be used with a four-pronged plug. Same with three-pronged outlets---they only work with three-pronged plugs.
2) Inspect the plug. Make sure it hasn't been cut or tampered with. Four-pronged plugs can't be cut down to fit a three-pronged outlet. Three-pronged plugs mustn't be forced into four-pronged outlets. A three-pronged plug mustn't be used in a two-pronged outlet, either.
3) Replace blown fuses, or if there's a circuit breaker, check it for tripped breakers. Sometimes the trip won't be obvious, so cycle the circuit breakers. Turn them all the way off and then back on again.
4) Plug another appliance in the outlet. You will find this easier with three-pronged appliances. Simply plug a toaster, or other appliance into the microwave's outlet, and see if it works. If it works, you know the problem is with the microwave, not the power circuit. Have the microwave serviced or replace it. If the toaster or other appliance doesn't turn on, you know the problem is with the circuit.

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Cuts out everytime you put food in, any mode any food, then displays sensor on panel displayed. May run for a few seconds then cuts again Rob.


Hi there,

It could be either the magnetron thermostat or the cavity thermostat would be faulty, depending on the microwave but in most cases it would be a thermostat.
First of all you can try cutting the power to the unit for 5 minutes, then retry it.
Call 800-626-2005 GE costumer care You will probably need to provide your serial number when you call so be sure you have that ready.

Good Luck!!

Thanks

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Microwave shuts down after cooking three or four minutes


Your magnetron is overheating and tripping the thermostat, which interrupts power until it cools.

Since it's less than one year old, it should be fully covered under warranty. I'd suggest contacting the manufacturer to get it fixed free.

You can find your nearest Maytag-authorized servicer here.

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

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