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Troubleshooting a Gas Furnace - Furnace Repair

By Bob Formisano, About.com

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PROBLEM: Gas Furnace Has Noisy Operation


Gas Furnace Has Noisy Operation

Possible Causes

  • Higher pitched "squealing" sound may be caused by slipping blower belt or motor or shaft bearings in need of oiling
  • Lower pitched "rumble" sound may be caused by a poorly adjusted pilot light if this problem occurs with the burners off.
  • Lower pitched "rumble" sound may be caused by dirty gas burners if the problem occurs with the burners on.

    Possible Repairs

  • Oil blower motor lubrication ports (usually at each end of shaft) with light weight oil
  • Check for proper belt tension. Belt should depress about 1" at center of span.
  • If too loose, tighten belt.
  • Replace frayed belt.
  • Adjust pilot light
  • Call furnace service technician to have burners adjusted or cleaned.

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