Have HVAC Questions? Ask an HVAC Expert for Answers
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Often the cause is a bad contactor on the outside unit if the contactor coil is drawing too much current when it closes that will happen. You should remove 1 wire from the outside contactor coil and then try it if it does not blow replace the contactor.
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I see that now, on those disconnect the low voltage wiring from the board does it still blow?
Have you tried a 5 amp fuse to make sure it is a dead short.
Yes thanks let me know