If the furnace fires but the blower fails to engage in the "Auto" setting

Common Questions: Is the rotation direction reversible for this wheel

shaft adapter

including HN51CB024 (converting from 1-pole to 2-pole)

Viessmann 7855596 Radial Fan 319825-402 If the furnace fires butThe Viessmann 7855596 Radial Fan is a precision engineered OEM replacement part designed for Vitodens 100 W B1HA and B1KA series condensing boilers. As a critical NRG118 combustion blower, this component features a high durability die cast aluminum housing and a steel impeller, specifically balanced to maintain the exact air fuel ratio required for efficient premix combustion. Whether you are servicing a B1HA 26 35 or B1KA 26 35 residential wall