| Before giving up on the motor, check to see if it is getting power. On a modern HVAC set up, there is a control board in the furnace with logic controlling a relay that switches power to the motor, or selected coils. If the motor has several colored wires going to it, check to see if any of them are hot. If not, the problem is in the controls. A good first check is to give any little square boxes on the board a rap with a screwdriver handle. If the blower takes off, the relay is bad. The motor may also have a bad start capacitor, although usually when they go, the motor at least buzzes. |