How to Repair a Furnace Belt


When the furnace blower is not operating as it should, you may have a worn or broken furnace belt. The furnace motor drives the blower wheel using the furnace belt. The best way to repair the furnace belt is to replace it. Purchase replacement belts at appliance repair shops and replace the belt yourself. You must access the blower compartment on your furnace, which is usually in the bottom half of the unit.

Things You'll Need

  • Phillips-head screwdriver
  • Socket wrench set
  • Turn the electrical power off to the furnace. The circuit breaker will be in the home electrical panel. There is also an emergency cutoff switch next to the furnace.

  • Remove the access panel to the blower housing. Most panels will lift up and then away from the furnace. You may have two screws securing the top of the panel to the unit. Remove the screws with a Phillips-head screwdriver.

  • Loosen, but do not remove, the mounting bolts that secure the motor to the furnace with a socket wrench. Slide the motor toward the blower to release the tension on the belt.

  • Pull the belt off the blower wheel pulley and the motor pulley. Take the belt to an appliance repair shop or HVAC dealer to purchase a replacement.

  • Place the new furnace belt over the blower wheel pulley and motor pulley. Pull the motor back until there is only ½ inch of slack in the middle of the furnace belt. Tighten the bolts with the socket wrench to secure the motor.

  • Set the access panel back into place over the blower compartment and secure the panel with the retaining screws. Turn the power supply back on to the furnace.

Tips & Warnings

  • Always turn the power supply off to the furnace before attempting any repairs.

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