If the fan does not start running
If the fan is not running, check the fuses or circuit breakers for the furnace and heat pump. If the
breaker is tripped or the fuse is blown, then check the wiring in the furnace for signs of damage. Look
for scorching and melting of wires as well as connections that have been damaged. Repair any wiring
problems then you can reset the breaker or replace the fuse.
If the fan still does not come on, the fan relay, furnace control board, thermostat, blower
motor, or control transformer could be the problem.