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Panasonic NN-8507 microwave, FFFF?

Discussion in 'Electronic Repair' started by Chianti, Mar 14, 2007.

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  1. Chianti

    Chianti Guest

    Fellow techs,

    I have this Panasonic NN-8507 microwave combi in for repair. Every separate
    function seems to work.

    But when i use the combination button, micro and heater together, it seems
    to go well for 4 minutes...then on the display i get 'FFFF' and the
    microwave stops functioning.

    I can only see 2 temp. controllers and 1 humidity(steam) sensor. The
    temp.controllers seem to function allright using a lighter to heat them up
    and they both switch off when getting too hot.

    What else could cause this FFFF in the display?

    (ps: I am an electr. engineer and thus aware of the dangers inside a
    microwave, dont worry.)

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