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Nn-h644wf microwave turns off after a few seconds

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  • srw11 May 12, 2008

    Problem: nn-h644wf
    posted by srw11 on 05/11/2008

    microwave turns off after a few seconds

    if the fan running ? yes, fan & light work ok
    is the ports into the food heating chamber clogged? no, all ports are clean.

  • srw11 May 14, 2008

    led panel stay lit and counting down the whole time or does it blink off.

    yes it blinks off after a coupole of seconds

    when i try using the sensor cook button it stays running for 8 to 10 seconds and then turns off

    I've cleaned the unit inside ond out and checked for any loose connections with no joy...


    sounds like a cut out switch malfuntion..

    Just need to narrow down the right part???



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If the fan running ?
is the ports into the food heating chamber clogged?

Posted on May 12, 2008

  • Karl Whisenand
    Karl Whisenand May 12, 2008

    it may be the thermal fuse kicking off as the magnetron heats up.
    but if that was true then you could not restart it immediately.
    but if it has to rest and then you can restart it then it is overheating
    does the led panel stay lit and counting down the whole time or does it blink off.

    take a look at this site as it may help you diagnose error.



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There are a number of possible causes.

The following link will take you to a page with the diagnostic flow chart that you can use to troubleshoot this issue:
Microwave Fault Codes

This customers review of that issue may also be of some help:
Customer Reviews Panasonic NN T945SF 2 2 Cubic Foot 1250 Watt Microwave...

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Inverter replaced , Failed gain

The magnetron may also be bad, or if there were any weak or inadequate solder joints on the board, that can cause some pretty spectacular failures.

Here are some links you or someone you know can use (in order given) for test help, but read the safety warnings first:
(continuity can be good even though it is bad!) (if it is NOT shorted, it\'s probably fine)

Good luck.

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