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I am troubleshooting a goodman package unit

All the wires on the schematic are in correct places, but everytime i try to plug in the 220v cord it pops the 3amp fuse on the control board?

also the model # and serial# are scratched off

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You have a short to ground somewhere in the low voltage wiring.

You will need an OHM meter to test each 24V component for continuity to ground.

Test each part with the wires disconnected. If all the parts are OK, then it is a wire touching somewhere. (unlikely but pssible)

I would start testing at the 24V side of the transformer. Often times it is the boad that has shorted internally.

Sometimes you can look at the back of the board and see burn marks where one circuit has shorted to another.

Contactor and relay coils are also known foir this problem. (24 V coils power the relay, sending high voltage to its corresponding component.)

Posted on Jan 14, 2009

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