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Blower Won't Work on Central Air

On a central air conditioning unit, the blower is generally located within a lower chamber of the furnace, found inside the house or building, not outside within the compressor unit. Return air in the HVAC system passes through a filter within the same compartment as the blower, and the blower sends the air along for the cooling coils to extract the heat from it and send it to the supply ducts. Troubleshoot a blower that isn't working to keep the air moving through the system.

Things You'll Need

  • Replacement fuse
  • Wrench
  • Replacement blower belt
  • SAE-10 nondetergent oil
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Instructions

    • 1

      Check the corresponding fuse or circuit breaker to the furnace blower. Replace a burnt fuse or reset a tripped circuit breaker.

    • 2

      Turn off the central air unit. Remove the cover of the compartment that houses the blower inside the bottom of the furnace. Remove the filter if it is blocking your access to the blower.

    • 3

      Examine the belt on the blower for cracks or fraying. Loosen a setscrew on the blower, using a wrench, and move the pulleys on which the blower is installed closer together. Remove the damaged belt.

    • 4

      Install a replacement belt on the pulleys. Adjust the pulleys to their original distance apart, and tighten the setscrew. Press down on the belt with your finger, and make sure the belt is at a tightness to where it depresses about 1 inch.

    • 5

      Place a few drops of SAE-10 nondetergent oil into the oiling ports on the blower. These holes are normally found on the blower's motor and pulley.

    • 6

      Reinstall the filter, or install a new filter if the present one is clogged with dirt and debris. Place the cover back on the blower compartment. Turn on the central air unit and observe whether the blower moves the air normally.

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