Forum Discussion
enblethen
Mar 11, 2019Nomad
The relay in the AC unit could have bad contacts.
Start by posting model of furnace,
If you can jumper the two blue wires in the furnace. This will by pass thermostat and relay. Furnace should start and produce heat. Remove jumper, furnace should go into cool down mode and shut off shortly.
If fan in furnce does not start, check for 12 volts DC at furnace.
Power present check for circuit breaker normally attached to fan housing on many models.
Start by posting model of furnace,
If you can jumper the two blue wires in the furnace. This will by pass thermostat and relay. Furnace should start and produce heat. Remove jumper, furnace should go into cool down mode and shut off shortly.
If fan in furnce does not start, check for 12 volts DC at furnace.
Power present check for circuit breaker normally attached to fan housing on many models.
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