BoilerFaultCodesTechnical description
Check diagnostic code. (turboMAX Plus only) check diverter valve spindle against blade lightly. Replace diverter valve.
What causes this fault?
This status occurs when the boiler's internal pre-heat function, known as Warmstart, is active to ensure hot water is available quickly. It is triggered either by the boiler periodically heating its own internal store or when you turn on a hot water tap. This is part of the appliance's normal operation and indicates the system is working as intended to maintain comfort.
DIY fix possible
Check if the hot water tap is currently runningTurn off the 'Warmstart' comfort function using the dial if you do not want the boiler to fire periodically to keep water hotMonitor the display to see if it switches back to a heating or standby code once the demand ends