Noritz
Combustion Fan or Pump Noise
Boiler emits a high-pitched whine or loud humming during operation.
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Safety Warning
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.
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Possible Causes
Worn fan bearings, Cavitating circulation pump, Debris in fan wheel, Loose mounting hardware
How to Fix / Troubleshooting
Safety: Turn OFF power before touching moving parts.
- 1. Isolate source: Listen carefully to determine if the noise comes from the combustion fan, circulation pump, or piping.
- 2. Check system pressure: Low system pressure can cause pump cavitation. Verify pressure gauge is within the recommended range and top up if needed (per manual).
- 3. Inspect fan and pump mounts: Ensure mounting screws for the Noritz combustion fan and system pump are tight and that vibration isolators are intact.
- 4. Professional replacement: Persistent whining usually indicates bearing wear; a technician should replace the noisy fan or pump.
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Repair Difficulty
Medium
3/5
Required Part
Combustion Fan Motor Assembly
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