Micro farads are often abbreviated uf and sometimes mfd. If it works the stopstart function of the capacitor has failed and needs to be replaced. Why Would You Need To Replace A Capacitor In An Air How To Troubleshoot Fix An Air Conditioner Diy W How To Buy A New Furnace Blower Motor And Capacitor Hvac First be sure that the capacitor is discharged before using it for safety reasons. Furnace run capacitor replacement . Electrical motors that require an extra push to make them rotate use capacitors. The capacitor will be located close to the blower motor since it is there to help the blower motor run and have wires coming from it. The average furnace motor replacement can run about 450 including parts and labor. Hvac contractor wanted 250 to replace it. Remove the blower housing inside the furnace to access the capacitor. How do i check the fur...