Chaffoteaux Pump Bearing Wear / Cavitation

Furnace runs but makes a high-pitched whine or grinding noise from the pump area.

This repair may involve working with high voltage components or water connections. Always unplug the appliance before removing any panels.

If you are not confident in your ability to perform this repair safely, we strongly recommend contacting a professional technician.

Possible Causes

Worn pump bearings, Air in pump, Debris in pump impeller, Pump running dry due to low pressure

Safety: Isolate power before touching the pump.

Check system pressure: Ensure pressure is adequate to prevent the pump from running dry.
Bleed pump: If the pump has a bleed screw, carefully vent air until water appears.
Listen after restart: Restore power and call for heat. If the noise persists or worsens, the pump is likely failing.
Replace pump: A noisy pump should be replaced by a qualified technician to prevent complete failure.

Medium 3/5

Primary Circulation Pump

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