Question about Microwave Ovens

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I am a homeowner . My Fridaire built-in microwaveoven powers on however it doesn't heat things. Can I fix it or do I need to call a technician? Thank you. Jim

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  • Gary Davd
    Gary Davd May 11, 2010

    you need to check for power going to the large transformer if you get 115v there when the unit is turned on you have either a bad mag tube or transformer or diode if no power your relay on the ctrl board is bad check that and let me know

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  • Microwave Ovens Master
  • 8,820 Answers

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 a friend 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.

Posted on Mar 08, 2008

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It just beeps when plugged in cannot press anything to start it timer menu does light up model # nn-sn960s panoasonic micro wave


Panasonic Microwave - ConsumerAffairs.com

www.consumeraffairs.com > Homeowners > Microwaves

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After looking, door was starting to arc and burn around the edges in three places, ...You can't leave this oven unattended for a minute or you could be calling 911! ... In October 2014 I purchased a Panasonic microwave model NN-SA661S. ... The timeremits "4 beeps" when the time is up; other microwaves, continue to beep ...

[PDF]operating instructions - FTP Directory Listing - Panasonic

ftp://ftp.panasonic.com/microwaveoven/.../nn-sn651_nn-sn661...

PanasonicModels no. nn-sn651b ... nn-sn661s .... Use this appliance only for its intended use as described in this manual. do ... Thank you for purchasing a Panasonic MicrowaveOven. ... you press Start. note: The Glass Tray can turn in either direction. ..... If a pad is pressed and no beep is heard, the unit did not or cannot accept the

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How do I turn on the microwave and set the clock


well setting the clock comes first if my memory is right

Jan 14, 2016 | Microwave Ovens

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Not heating efficiently; works but doesn;t heat as well


If it is taking longer to heat things than normal then it would appear the Magnetron to starting to wear out, this is a normal sign of inefficient power from the magnetron & would need to be replaced.

Dec 26, 2012 | KitchenAid Microwave Ovens

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Sharp micro doesn't heat


see this causes and fix it. God bless you
Diode The high voltage diode converts the A/C power output of the transformer to D/C, doubling the voltage to nearly 5,000 volts. This high voltage powers the magnetron which emits the energy that cooks the food. If the diode burns out, a lower A/C voltage reaches the magnetron, which is not sufficient to power the magnetron. When the diode fails it is often visibly burned out. If it appears to be good, it can be tested with a volt-Ohm meter capable of testing diodes. High voltage diodes frequently fail and are one of the most common points of failure in a microwave oven.

Door Switch If the microwave does not heat, one of the door switches might be defective. Microwave ovens normally have three door switches, if any of them fail the microwave does not turn on and does not heat. Check the switches for continuity with an Ohm meter.

Magnetron If the microwave oven doesn't heat the magnetron tube might have burned out. The magnetron uses high voltage, high current DC power to generate the microwave frequency that cooks the food. If the microwave oven is turned on when it is empty this can cause the magnetron to burn out. Once it is burned out it has to be replaced, it's not repairable.
High Voltage Capacitor If the microwave doesn't heat the high voltage capacitor might be defective. The high voltage capacitor works with the high voltage diode to convert the output of the transformer to DC voltage and to double the output voltage. If the capacitor is burned out the entire high voltage circuit stops working properly. The high voltage capacitor can be checked with a special VOM meter which has a capacitance testing capability. Be aware that the high voltage capacitor can retain a charge of more than 3,000 volts and can injure or kill a person if not handled properly. Only trained technicians should perform this type of testing.

High Voltage Transformer If the microwave does not heat, the high voltage transformer might be burned out. Microwave ovens produce a very high voltage in order to power the magnetron antenna, which emits the energy that cooks the food.

Thermal Fuse If the microwave doesn't heat the thermal fuse may have blown. It can be tested for continuity. Watch our fuse testing video for more information.

Thermoprotector If the microwave doesn't heat the thermoprotector may have tripped. This is a safety device to prevent the microwave from overheating. It can be tested for continuity to see if it's blown.

Main Control Board If the microwave doesn't heat the main control board may be defective. This is not common. When a microwave doesn't heat the problem is usually within the high voltage circuit; either the high voltage capacitor, diode, transformer or magnetron.
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Oct 02, 2012 | Sharp Microwave Ovens

1 Answer

My Kenmore Built-in microwave doesn't heat and the turn table doesn't turn. Model 911-47812200


It is good that the microwave does not work all together. It might be an interlock button or even a relay connection burn on the main mother circuit board.

Need a qualified technician. The service manual will be like $20-50.

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Nov 22, 2011 | Microwave Ovens

1 Answer

The probem is ....the microwaveoven is not heat (kitchenaidKHMS2056SSS). Live of microwave.....4 months.\\ Could you please tell me if we can fix this problem.....we lost the manual of this...


It sounds like the magnetron may have either failed or is not being supplied with the extremely high voltage required to run it.
Make sure the !!!!capacitor is discharged!!!!! before attempting any sort of repair.
Check the door interlock switches first then the high voltage diode with either an AVO model 8 on high resistance range for short circuit, the feed fuse on the primary of the high voltage transformer and then finally, the magnetron is best checked by substitution.
Hope that helps.

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Kenmore built in microwave displaying "D" and wont heat.


"d" may mean demo mode. The first thing to try is a "hard reset". Unplug it from the power outlet for 10 minutes, plug it back in, set the clock, then try again.

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1 Answer

Can you microwave an aluminum tray (ex: frozen meal)?


No, this is not recommended. the newer microwave will not flash but, if you put aluminum inside, it will damage the Magnetron. this creates the heat and, if it is damaged, you will lose the heating action in this unit and the Magnetron is not a cheap replacement part.

I do not recommend inserting any aluminum objects at all.

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Home warranty company saying JennAir M166 built in microwave isn't a true built in


Bottom line is... Home warranty companies will do anything possible to wriggle out of paying for something. (Especially if it's American Home Shield).

I'd suggest offering to fax / email photos and the front cover of your owners manual. Your model is 100% considered a built in unit and they are lying to you and trying to cheat you if they say otherwise.

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