Worcester Greenstar fan faults: reading a code that has two halves

What Does Error Fan fault group Mean?

Worcester Greenstar boilers report faults as a display code and a fault code together, and the pair is what identifies the condition. Fan-related entries in that convention describe the appliance being unable to establish or confirm the fan speed it requires, which prevents combustion because gas is metered against the air the fan delivers. Applies to: Worcester Bosch Greenstar gas boilers using the two-part display and fault code convention described in Worcester service instructions Worcester uses the two-part convention across the Greenstar range but the specific pairing differs between models and generations. Record both parts exactly as the display shows them and match them against the service instructions for the model on your appliance data plate rather than a list compiled elsewhere. Owner-safe checks: Photograph the display so that both code elements are captured, along with anything else shown on screen. | Copy the full model name and serial number from the data plate, which is behind or beneath the casing flap on most Greenstar appliances. | Listen during one start attempt and note whether a fan is audible and for how long. Qualified technician: Diagnosing and replacing a boiler fan, and testing its wiring and feedback, are Gas Safe registered tasks on a room-sealed appliance. | The casing forms part of the sealed enclosure between combustion and the room, so it is not removed for inspection by an occupant.