BoilerFaultCodesTechnical description
fan overrun
What causes this fault?
This fault occurs when the boiler's internal computer detects that the fan is spinning for too long or at an unexpected time during the ignition sequence. The most common reason is a communication error between the fan and the main control board, or the fan itself beginning to wear out and failing to stop when instructed.
DIY fix possible
Check if the boiler eventually progresses to the next stage of operationPress the reset button once to clear the status codeEnsure no external debris is blocking the flue terminal outside
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