BoilerFaultCodesWhat the manual says
Manufacturer manualNo fan signal available
From this model's manual
Verified against the Worcester Bosch Greenstar 8000 Life Style installation & service manual, page 80.
What causes this fault?
This fault occurs when the boiler's main control board loses its electronic connection with the fan motor, preventing the system from safely venting exhaust gases. The most common reason is a component failure within the fan itself, a loose connection in the wiring, or a fault on the circuit board that stops it from sending the correct instructions.
Engineer required
This is a high severity fault. Stop using the boiler and call a Gas Safe registered engineer. Do not attempt gas-related repairs yourself.
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