Pentair
Combustion Resonance / Airflow Noise
Heater emits a loud whistling or howling noise from the exhaust or burner area.
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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
Improper gas pressure, Partially blocked vent, Misaligned burner orifices, Wind interacting with vent termination
How to Fix / Troubleshooting
Safety: Turn off power and gas if the noise is severe or accompanied by abnormal flame behavior.
- Check vent and intake: Ensure vent piping is installed per Pentair guidelines and is free of obstructions or sharp bends near the heater.
- Inspect burner and orifices: Have a technician verify that burner orifices are clean and properly seated, and that the burner tray is correctly positioned.
- Gas pressure adjustment: A licensed gas technician should measure and adjust gas pressure to within Pentair’s specified range.
- Wind considerations: If noise occurs only in high winds, consult installation guidelines for vent terminations and possible wind screens.
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Repair Difficulty
Hard
4/5
Required Part
Burner Orifices / Vent Assembly
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