BoilerFaultCodesTechnical description
Hot water requirement error
What causes this fault?
This status occurs when the boiler receives a signal to heat your water but cannot start the burner because it has recently finished a heating cycle and needs to cool down internally. It is often caused by a communication lag between your external timer and the boiler, or a mechanical delay in the internal valve that directs water to your taps. In many cases, it is simply a 'waiting' state rather than a permanent mechanical failure.
DIY fix possible
Check if any hot water taps have been left slightly openTurn the boiler power off and back on again to reset the internal clockEnsure your external timer or thermostat is not stuck in an 'on' position
Find a Gas Safe engineer
Search the official register →