De Dietrich S100611 EBM G1G170 fan

This fan is a combustion air supply and flue gas exhaust component used in room-sealed boilers. In modulating premix burners, the fan speed determines the firing rate: the burner control varies the fan speed, and the gas valve follows proportionally. Parts of this type are selected by air flow and pressure requirements, outlet orientation and direction, impeller diameter, voltage, and control mode (mains, PWM, or 0–10 V). The flange pattern must also match the appliance. Typical failures include worn bearings, imbalance from deposits on the impeller, a failed capacitor, or speed feedback errors that the boiler control interprets as an airflow fault – often leading to a lockout code. When replacing a fan of this class, confirm the electrical supply and control signal type (e.g., PWM or analogue). Check the outlet orientation relative to the burner housing, as well as the mounting flange dimensions. The impeller should be inspected for debris or damage. Always verify that the air pressure switch tube connections are clean and correctly routed after installation. The fan works together with the burner control, which monitors speed feedback; any mismatch in the feedback signal may cause the control to shut down the burner.