BoilerFaultCodesTechnical description
Boiler in hot water anti-cycle mode
What causes this fault?
This code appears when the boiler has reached its maximum internal temperature for hot water and needs to briefly shut down the burner to cool down. It is often caused by a lack of water flow through the heat exchanger, or because the taps have been turned on and off very quickly several times. By entering this mode, the boiler is simply protecting its internal components from excessive heat and wear.
This can be slightly more common in summer, as the incoming mains water is naturally warmer and the boiler reaches its target temperature much faster than in the winter.
DIY fix possible
Wait up to 15 minutes for the anti-cycle timer to expireEnsure hot water taps are fully closedCheck that the hot water temperature setting on the control panel is not set excessively high