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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