Question about Kenmore 63252 Microwave Oven

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I have kenmore microwave model 721.80012401 it does not heat, I checked the magnetron thermostat, capacitor and the only thing that does not check out is the diode,can the diode cause this problem?

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Yes your diode can keep it from heating but it usually makes a loud growling if diode is bad. there is also another thermal disc on the other side of the oven that could be open. usually can see it in a hole in the plastic with 2 wires. if there is continuity on both this and the mag thermal, you may have a bad magnetron

Posted on Feb 12, 2012

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Posted on Jan 02, 2017

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SOURCE: Microwave heats but slowly.

This is the second time I have requested assitance on this site with no response. The beginning of this thread dates back two months. Why would I ever want to pay for support when it is so poor at this level?

Posted on Mar 04, 2008

  • 1126 Answers

SOURCE: need installation instructions

http://www.managemyhome.com/mmh/lis_pdf/OWNM/L0411402.pdf
I could only find the owners manual. Hope this helps.

Posted on Sep 03, 2009

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Jan 04, 2011 | Kenmore 63252 Microwave Oven

1 Answer

Our Kenmore microwave turns on, makes noise but has no heat. Any suggestions?


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 capacitor can fail and go 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.


Dec 30, 2010 | Kenmore 63252 Microwave Oven

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I have a Kenmore model 66561689101 that doesn't heat properly anymore. What is wrong?


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1 Answer

Kenmore microwave model 665.68681891 runs but won't heat


Test the high voltage capacitor, the rectifier diode.or the magnetron. If all this are fine, test the control board.

If it additionally does not spin and no light, then check also the door switch and fuse.

The diode and capacitors can br tested. The capacitor must be allowed discharge before testing, or you risk to get electrocuted, even if power is off. Capacitors can get discharged by shorting their two contacts.
Replace the magnetron if the checks and all of the high voltage component tests are good, but the unit still does not heat.

All locations, and description of this parts can be located using the diagram here: Counter top.

Parts must be tested to find out what is wrong.

Remember that microwaves are potentially dangerous devices if not repaired properly, the job must be done by a competent person.
A microwave energy leakage test must always be performed when the oven is serviced for any reason.

Regarding parts, contact the seller here to purchase parts. (here in UK).

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Mvh1615


It doesnt matter how old a system was. components can be failed at any point in time. unplug the unit. carefully disassembly and visually check the diode near magnetron and capacitor, it might be broken.If seems good, check the thermostat continuity,if beeping. changage your magnetron. be careful capacitor store charges that deadly. discharge the capacitor first.
when you change mag. change the diode too.

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This is the second time I have requested assitance on this site with no response. The beginning of this thread dates back two months. Why would I ever want to pay for support when it is so poor at this level?

Jan 06, 2008 | Kenmore 63662 / 63664 / 63669 Microwave...

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