My furnace has been acting up for some time. The coils will heat up but the fan, in the auto mode, won't kick on. I can put the fan in the fan only and it will run. I have replaced all 3 relays in the furnace. I have replaced the thermostat and the cap on the motor. It still does the same thing. It will work for a while and then not stsrt the motor. Can some one please help.
Thanks