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 for any temporary blockage in the external flue terminalMonitor the boiler as this is a status code that usually resolves itselfPerform a system reset to see if the status clears
Find a Gas Safe engineer
Search the official register →