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Teruo Sugihara
Teruo Sugihara Posted on May 26, 2012
Answered by a Fixya Expert

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Microwave light stays on and unit won't heat/run

I think I'm having a door interlock switch problem and would like to determine the switch or switches to replace (of the three that are actuated by the door latch). Note that the fan and surface light do work as does the clock. Previously the magnetron fan would turn on when the door was opened, but the magentron was not running. The unit would heat by turning it on as usual. I inspected the latch mechanism and blew off the dust on the circuit board (using difluoroethane). Now, the interior light stays on but the unit will not heat.

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Kevin Getz

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  • Posted on May 27, 2012
Kevin Getz
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If it's not heating at all, the magnetron is to blame.

5 Related Answers

Anonymous

  • 6784 Answers
  • Posted on May 29, 2009

SOURCE: microwave buttons not responding - microwave running constantly with door shut

OK, you will need to replace the magnetron and the touch pad as well. this will fix this issue.

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MicrowaveSvc

William Miller

  • 9179 Answers
  • Posted on Feb 23, 2007

SOURCE: microwave seems to turn on when door latch is opened

What's happening is you are activating one door switch a little before the other, and that is causing your light, fan, and turntable to come on. The plastic parts are not perfectly rigid, so they flex a little when you press the button, and that causes the lag to be more apparent. Even if you press the door open faster and look really close, you may notice the light, fan, and turntable coming on for a split second. That's perfectly normal. The relay on the control board must also be turned on before it will actually be cooking.

MicrowaveSvc

William Miller

  • 9179 Answers
  • Posted on Nov 26, 2008

SOURCE: microwave will not stop running

http://www.microwavedisplay.com/doorsw.txt

pwrsce

  • 63 Answers
  • Posted on May 19, 2009

SOURCE: everything seems to work but not heat

the switch is ok. if it was bad itt would blow the fuse. ge had magnetron problems on the 1600 series. if you have an amprobe and are getting 110 volts from the control to the transformer. place the probe around just 1 wire to the transformer. if you get less than 12 amps replace the mag

Anonymous

  • 2382 Answers
  • Posted on Oct 07, 2010

SOURCE: jes1290 microwave runs but no

Hi, if it keeps running when the door is open, that's usually due to a bad door switch or broken / loose door switch mount. You just need to fix the door switch or door switch mount to solve the problem....

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