Question about Microwave Ovens

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Microwave will run but will not heat?

All functions work, with the exception of heating, I set the time to run and the mocrowave runs but will not heat anything.

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  • Anonymous Feb 10, 2008

    Have same problem. Whirlpool Gold Accuwave....all functions work except heat.

  • shilps04 Jul 16, 2008

    I have the same problem. I try to heat up something and it goes on for a few seconds and then I get a "F7" error and the microwave stops.

  • bepm Aug 21, 2008

    Our KitchenAid intermitently is failing with the F7 error code when heating is started. The unit is just under 3 years old. I have just started to research causes for this problem and would appreciate any advice. Thank you.

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  • 58 Answers

**CAUTION**
HIGH VOLTAGE IS PRESENT IN CAPACITORS. THIS COULD SERIOUSLY INJURE YOU. DO NOT ATTEMPT IF YOU ARE INEXPERIENCED! IT IS CHEAPER TO BUY A NEW MICROWAVE THAN PAY FOR AN EMERGENCY ROOM VISIT.

The magnetron probably needs to be replaced. You can test it with these instructions.
http://www.gallawa.com/microtech/mag_test.html

Posted on Feb 02, 2008

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Posted on Jan 02, 2017

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How do i adjust power level


There are no heat levels on a microwave oven, only power levels. I am not aware of any method of checking the power level except to boil water. Boil water at each level and time how long it takes to boil. The lower the power, the longer it should take. If there are no differences in the time, the oven is not functioning as expexted.

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Not heating


Hello


Power Supply

Check whether there is a proper power supply. Look to see whether the cord is connected to a grounded 3-prong outlet and the cord is fully plugged in. If the electrical system is built-in and no power cord is visible, replace or reset the household fuse or circuit breaker.

Microwave Functions

Some basic microwave operational steps may affect whether the microwave is heating. Open and close the microwave door, as the unit will not function with the door open, and push "Stop/Clear" to cancel any previous settings, such as the timer, which do not heat the microwave oven.

Setting the Microwave

Once the power to the microwave has been reset, or verified as working, and the microwave is ready to run, select a new cook cycle and press "Start" to see if the microwave begins to run and cook food as expected. Allow the food to cook for the alloted time and then open the microwave door and check to see if the food has cooked or heated. Choose a longer cooking time and restart the microwave if food is heating but is cooking slowly.

Repair

If all efforts to troubleshoot the function and power to the microwave still do not get the appliance heating food as expected, there may be a repair issue that needs to be addressed. Contact professional technician for advice.

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My mocrowave does not heat items. It can be truned on and runds for the alotted time but it does not heat or thaw. Kenmore #88343


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If you use the microwave and forget to clear the time remaining. Or, if you just leave the food inside, the microwave will start itself in the Pizza mode. I guess it thinks the pizza needs to be reheated??...


You should have a 'clear' button on your oven.

Try to not open the door with the oven running. This causes arcing at the door safety interlock switches and they will fail.

You will know they failed when everything works but there is no "heat". No heat because the oven will think the door is open ... even though you know the door is closed.

Enjoy your new oven ... they are great. I dont know how the Mrs and I would eat if not for the mocrowave!!!

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Usually in ther case of this problem, even a technician will advise you to replace the unit, in the minds of cost effectiveness and safety...

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I did more research along with the suggestion of an apprentice to have person to fix the microwave. I was unable to fix it myself. The microwave needs a magnetron .

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Everything works except heat


Sounds like you've had a failure in the microwave portion of the unit.

Microwave not heating problems when the timer/controller board appears to function properly, are related to the following components -

1) Diode
2) Capacitor
3) Transformer
4) Magnetron

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