BoilerFaultCodesTechnical description
Filling/draining programme: The preference changeover valve moves to the centre position. The burners and pump are switched off.
What causes this fault?
This code appears when the boiler's internal software has been manually or automatically put into a specialized service mode for maintenance. It physically shifts the internal valves to a central position to allow water to flow freely through the system for filling or draining. Because the boiler is focusing entirely on moving water, it temporarily stops the burner from firing to prevent overheating.
DIY fix possible
Wait approximately 15 minutes for the program to complete automaticallyEnsure the blue filling loop handles under the boiler are fully closedRestart the boiler using the power button if the code persists for over 30 minutes