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Heating  Heating

Brand

AO Smith AO Smith List all brands

Type:

ATI-110C-N view ATI-110C-N List all types

Error code:

991
List all errors


Error code: 991

Cause of error code 991

Imperfect combustion

Solution for error code 991

• Check the gas type of the water heater.
• Inspect the environment around the water heater. Determine how long the unit has been installed.
• Check the altitude/elevation of the area of where the water heater is installed.
• Check if there is any blockage in the intake air and/or exhaust.
• Check whether there is enough distance between the concentric terminals.
• Check if there is grease and/or dirt in the burner (Part #101) and the fan motor (Part #103), especially if the water heater has been installed in a contaminated area.


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