Have HVAC Questions? Ask an HVAC Expert for Answers
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If that is blowing you have a short in the low voltage wiring or a contactor that is shorted and bad. You will need to start disconnecting the thermostat wiring to try and narrow down the bad wire. This could be from a rubbed through wire to ground or something shorted by the thermostat . I would remove some of the thermostat wires then try it again to get to the issue as this would be hard to say over chat and really you need to be onsite to find these wiring gremlins.
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