Weishaupt Poor Combustion / Sooting

Water heater runs but flue terminal shows signs of heavy sooting or dark stains.

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.

Possible Causes

Incorrect gas-air ratio, Blocked burner surface, Restricted flue, Wrong gas type setting

Safety: Sooting indicates dangerous combustion; shut down the heater and do not use it until corrected.

Turn off gas and power: Prevent further operation until inspected.
Flue inspection: Have a technician check the Weishaupt flue system for blockages or incorrect installation.
Burner cleaning: The burner and heat exchanger should be cleaned and inspected for damage.
Combustion adjustment: A certified technician must measure flue gases and adjust the gas valve and fan to Weishaupt specifications.

Professional Required 5/5

Burner Assembly

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