Navien
Fan or Pump Mechanical Noise
Navien water heater is excessively noisy with a high-pitched whine or grinding sound from inside the unit.
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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 combustion fan bearings, Debris in fan wheel, Failing internal circulation pump, Cavitation due to air in system
How to Fix / Troubleshooting
Safety: Turn OFF power before touching internal components.
Steps:
- 1. Identify noise source: Remove the front cover and carefully listen (with power ON) to determine if the noise is from the fan (top area) or pump (lower area). Do not touch moving parts.
- 2. Check for air in system: If noise is from the pump and the system was recently drained, bleed air from the recirculation loop or heating circuit.
- 3. Inspect fan area: With power OFF, inspect the fan housing for debris or foreign objects.
Persistent grinding or whining usually indicates a failing fan or pump that should be replaced by a technician.
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Repair Difficulty
Hard
4/5
Required Part
Combustion Fan Motor
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