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All brands · Furnace troubleshooting

Noisy

What is going on

Possible causes and checks for: noisy.

Likely causes

  • Loose fan or shutter
  • Worn pump
  • Dirty strainer
  • Air in line
  • Transformer hum
  • Draft regulator vibrating
  • Worn coupling
  • Motor/pump misaligned
  • Relay contacts chattering
  • Restricted line
  • Loose motor mount
  • Tight bearings
  • Tank hum

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Source: General HVAC service practice — verify per model. Written in our own words; check the manual for your exact model.

For licensed technicians. Gas, electrical and refrigerant work must be done by a qualified, licensed person. Shut off power and gas before servicing, never bypass a safety control, and follow the manufacturer’s manual for the exact model; it and local codes always take priority. HVACopedia is not affiliated with any manufacturer; brand and model names only identify the equipment.