Your boiler's fan is running longer than necessary to clear out exhaust gases, which may temporarily stall the start-up process.

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.