BoilerFaultCodesTechnical description
Filling mode: The prioritising diverter valve is moved to the mid-position. The burner and pump are switched off (to fill or drain the product).
What causes this fault?
This code appears because the boiler has been manually put into a specific service mode by a person interacting with the control panel. It is triggered when someone is intending to fill, drain, or bleed the system, which causes the boiler to pause its normal operation for safety. The boiler hasn't broken; it is simply waiting in a 'standby' state while maintenance tasks are performed.
DIY fix possible
Navigate to the boiler's digital menuExit the 'Check Program' or 'Filling' settingsRestart the boiler to return it to normal operation
Find a Gas Safe engineer
Search the official register →