Your boiler's fan is not spinning fast enough to clear the pipes, which prevents the system from safely lighting the gas to provide heating or hot water.

Insufficient fan speed for ignition

What causes this fault?

This fault occurs when the boiler's management system detects that the fan is rotating too slowly to safely expel exhaust gases. The most common reasons are a buildup of debris or dust hindering the motor, a failing electronic component on the fan itself, or the main control board failing to send the correct voltage to the motor.