Question about Microwave Ovens

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Lights dim when microwave runs. if runs more than 3 minutes it turns itself off and then resets after approx 10 minutes. I have had an electician here to see if it were the amps, it isn't.

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  • lc619 Apr 12, 2008

    the actual outlet is not being shared, but the ciricit is, with with 2 lamps and the overhead light in the kitchen. those are the lights that dim when micro runs.

  • kevin_taylor Sep 13, 2008

    just recently the power level on my microwave has been fluctuating. I do have some lights on the same circuit and when the microwave power fluctuates, the lights dim. I have had the same microwave and lights without any problem before, this problem has just recently started. the microwave is kind of old, maybe 8+ years. Do you think that the problem is caused by my microwave, or maybe I have a more serious problem with my home wiring.

  • William Miller
    William Miller May 11, 2010

    To clarify, if the house wiring is porper, I would first suspect the magnetron is failing and overheating, then tripping its internal thermostat.

    When it cools, it turns back on.

  • William Miller
    William Miller May 11, 2010

    Assuming you only have 1 thing on that breaker - the microwave, then I would say your magnetron or high voltage transformer is failing.

    Did your electrician verify that the outlet is not being shared by anything else?

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  • Microwave Ovens Master
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As long as those lights don't draw too much current, that will probably be okay.

The microwave may consume 1500-2000W (the model number tag or manual will tell you). Add that to the total of the wattage of the lights. Then divide that grand total of watts by 120 (the voltage) and that will give you current in amps that your oven and lamps draw.

Make sure your breaker is rated about 25% above that.

If that holds true, then then I would say your magnetron or high voltage transformer is failing.

If you can post back with your brand and model number I can give you some info on those.

Posted on Apr 13, 2008

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