Question about Kenmore 66222 Microwave Oven

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Kenmore Model 721.66222500 just suddenly stopped working. No light, no power, no nothing.

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I just had same problem happen on a Kenmore Model 721.89940490. I took off top panel and control panel. Behind control panel is a ceramic fuse. I pullud it out and checked with my mutimeter for continunity and it is blown. Since it is 20 years old I will get a new fuse and replace it. If it works good, if not I will have to go buy a new one to put under the cabinet. My contractor that built my house in 1994 directed wired it but I\'ll spend a little extra and put a plug in the cabinet, if I have to replace it. I suspect I won\'t but there is still that possibility.

Posted on Jul 14, 2014

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Posted on Jan 02, 2017

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MicrowaveSvc
  • 9085 Answers

SOURCE: Kenmore Microwave model 721 62624200

We see this a lot. The problem is almost certainly on the control panel, which we regularly repair nationwide for $39.95 postpaid.

This light failure often occurs when a bulb goes out and the filament shorts, or when the bulbs are removed or installed without first unplugging the oven from the power line. Either can cause such a failure on the controller.

Details of our service and critical safety information and disassembly information is at our site, linked here on Fixya:
http://tinyurl.com/yzjozk

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

Posted on Nov 26, 2007

MicrowaveSvc
  • 9085 Answers

SOURCE: kenmore microwave #721-89941-1490

There is an internal fuse, plus one or two thermostats or thermal cutouts.

You can probably find an exploded view by entering your FULL model number here: http://www.searspartsdirect.com

There may also be a "mini-manual" hidden inside the unit behind the control panel or hidden on the left side behind the grille, which is very helpful when troubleshooting & testing.

If the fuse is good, it may be an open thermostat or thermal cutout (TCO) / thermal fuse on or near the magnetron or on top of the cavity / body of the oven.

If it goes dead for a while during or after cooking then comes back on, the magnetron is probably overheating and causing the magnetron thermostat to open.

Then when it cools, it closes the circuit and allows power through again.

When checking thermostats, if it has a hood fan thermostat, that should read open, as opposed to the others, which should read closed.

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

Posted on Jun 29, 2008

bestdarngood
  • 3037 Answers

SOURCE: yesterday microwave worked fine today it doesnt

Sounds like the magnetron has failed. This is the component that produces the microwaves that heats the food.

The cost of the magnetron is about 95% of the cost of a microwave oven. Most people don't, for this reason, replace the magnetron, they replace the whole oven which is probably what you will end up doing.

There is a possibility that the circuit that provides power to the magnetron is faulty and you need to take it apart, find the proper electrical leads and test them with a volt meter. To do this you have to remove it from its mounting and take it apart. It is a fairly lengthy process however.


Benjamin

Posted on Apr 26, 2009

  • 1 Answer

SOURCE: kenmore microwave model 721-63252301 - no heat

we are going to try to find a fuse and replace that or just buy a new microwave

thank you

Posted on Jun 06, 2009

SOURCE: wjusino just asked: My kenmore microwave doesnt heat.

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 Jan 26, 2010

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

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