Protherm
Flow-Induced or Combustion Noise
Water heater emits a whistling or high-pitched noise 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
Partially closed gas valve or water valve, Scaled heat exchanger causing turbulent flow, Incorrect burner pressure, Fan speed issues
How to Fix / Troubleshooting
Safety first: Be cautious around hot surfaces and moving fan parts. Turn off power and gas for internal checks.
- Check valves: Ensure cold water inlet and gas isolation valves are fully open.
- Descale heat exchanger: If noise is accompanied by reduced performance, descale the heat exchanger.
- Fan and flue check: Inspect the fan and flue for obstructions that may cause resonance.
- Combustion adjustment: Have a technician verify burner pressure and adjust if necessary.
Warning: Do not adjust gas valves without proper instruments and authorization.
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Repair Difficulty
Medium
3/5
Required Part
Primary Heat Exchanger / Fan Assembly
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