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Viessmann boiler error 6a

Viessmann boiler error 6a

Viessmann boiler error 6a A boiler may show error 6a or the ACGI code if the fire damper is not open. If a boiler has a 6a error, it could be due to a small number of reasons: -The fire damper is closed -The water level is too low -No power to the unit -Insufficient...