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Microwave runs, but food does not heat

I have a Kenmore microwave, model 721.63252.
It runs, but the food does not heat.

Any thoughts? It's 4 years old

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  • Microwave Ovens Master
  • 12,061 Answers

In all likelihood the mangnetron has failed, or perhaps even the Power Supply. or a fault that is shutting the system down for safety reasons You need to have it serviced by a reputable service centre/man. Ensure you get a firm "Quote" before proceeding, and remember these days the cost of repair can equal or exceed the price of a new one.

Posted on Feb 01, 2010

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Posted on Jan 02, 2017

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Sounds like you don't have proper microwave-compatible plates or mugs. Must have lead in them, or in the paint (!?!) Try a plastic plate or even a paper plate. I can't think of anything that would make the microwave oven do that, UNLESS it's a microwave/convection oven, in which case, the convection heater must be coming on whenever you are trying to just use the microwave function.

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Check the door safety interlock switches. Be careful of the capacitor, potentially dangerous.

If the switches dont make a connection, the magnetron will not energize ... no heat

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My Kenmore 721.63259301 would not heat items up so I came here and saw the parts required and was just about to order them when I checked the online owners manual and found this. FULL FIVE-YEAR WARRANTY ON
THE MAGNETRON For five years from the date of purchase, if the
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fails due to a defect in material or workmanship,
Sears will repair it free of charge.
My microwave has a manufacture date of July 2009 so I will be taking it right to the closest Sears repair center for a free repair. I suggest everyone do the same.

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After use, fan keeps running and control panel not working


Hi, this is a major chip fault. this chip is located on the control board and, it is responsible for initiating the cooking cycle correctly. you will need to replace the control board asap. it has failed.

Jun 19, 2009 | Kenmore Microwave Ovens

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We purchased this microwave 4 months ago and the food is not heating up and do not know what model it is but it has a dial setting and is a stainless steel model.


Since it's less than one year old, it should be fully covered under warranty.

I'd suggest contacting the manufacturer or dealer to get it fixed free.

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

Jul 29, 2008 | Microwave Ovens

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It sounds like you press STOP two or three times to lock it. Maybe that (or another key) will unlock it.

The lock / unlock procedure will be covered in your owner's manual.

Or you can try a hard reset - unplug it from the wall for one minute, then plug it back in and try again.

If you don't have your manual, you can get one here. (Enter your model number without any spaces)

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

Jun 24, 2008 | Kenmore 62622 Microwave Oven

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Re:Kenmore microwave model number 721.6389300 Hi this "Over the Range Microwave" makes a low buzzing sound while running. It heats food perfectly well. Any help would be appreciated. Thank...


Assuming your fans are working, this may be a magnetron on its way out.

If it's within the 1-year warranty, I'd call Sears for service right away.

Otherwise, I wouldn't leave it alone while running, just to be safe.

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

Jun 21, 2008 | Microwave Ovens

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Kenmore microwave


Since it's under warranty, they will replace or repair it at their choice, and if they replace it, it will be the same model or a "like model".

I'd ask them about it.

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


Jun 04, 2008 | Kenmore 63663 Microwave Oven

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Microwave does not heat/cook


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 someone you know 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

There should also be a "mini-manual" hidden inside the unit behind the control panel, which is very helpful when troubleshooting.

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

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