Question about Goodman GMS90703BXA Heater

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Fuse blow each time I turn on air check for

I have a goodman gms9/gcs9 furnace
i have a problem where the
fuse blow each time I turn on air check for shorts tranformer wiring between thermistat and wiring from circuit board to compressor
all check out ok no shorted conditions
hoever fuse on the boarde still blows when turned on
what do you thing problem area could be

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  • 456 Answers

Disconnect the thernostat wires from the control board. Put a jumper wire between R & G put door back on and turn on power. Blower motor
should run, if it blows the fuse then you have a direct short between R &
G at the board. Do this with R and W(heat) and R & Y(cool).

By disconnecting the thermostat wires and reinserting them make sure that they do not touch when inserted into each terminal. If it still blows
that little 3amp fuse when jumpering between each sequence as mentioned above, then I think your board is bad. When Jumpering out the Y terminal you will have to have the AC wires still hooked up. If it
blows the fuse in that sequence. Disconnect the wires out at the condensor.

You mat have a bad contactor at the outdoor unit.

Posted on Jul 16, 2010

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