Pentair
Sooting / Incomplete Combustion
Heater produces soot around the exhaust outlet or dark stains on nearby surfaces.
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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
Restricted air intake or exhaust, Dirty or misaligned burners, Incorrect gas pressure or orifice size, Blocked heat exchanger passages
How to Fix / Troubleshooting
Safety: Turn off power and gas. Sooting indicates a serious combustion problem and potential carbon monoxide hazard.
- Inspect and clear intake/exhaust: Remove any debris or obstructions from air intake and vent termination.
- Check burners: Have a qualified technician remove and clean burners, ensuring proper alignment and port cleanliness.
- Verify gas settings: A licensed gas technician should check gas type (natural/propane), orifice sizing, and manifold pressure against Pentair specifications.
- Heat exchanger inspection: If passages are blocked with soot or scale, professional cleaning or replacement is required.
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Repair Difficulty
Professional Required
5/5
Required Part
Burner Assembly
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