Fondital
Poor Combustion / Sooting
Water heater’s flue terminal shows signs of soot or black staining.
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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
Insufficient air supply, Blocked burner, Incorrect gas pressure, Blocked heat exchanger fins
How to Fix / Troubleshooting
Safety: Sooting indicates dangerous combustion; shut down the heater and do not use it until serviced.
- Check air supply: Ensure ventilation grilles are not blocked and that the flue terminal is unobstructed.
- Professional service: A technician must clean the burner and heat exchanger, check gas pressures, and verify combustion with an analyzer.
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Repair Difficulty
Professional Required
5/5
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