BoilerFaultCodesYour boiler is performing a normal cooling-down cycle after heating your water, though if the code stays on it may suggest a minor communication issue between components.
This is a minor fault. Keep an eye on it and mention it at your next annual boiler service. Reset the boiler and see if it clears.
Technical description: DHW pump run on or for three way valve option, HTG pump run on with valve open to DHW (max. 5 minutes)
What causes this fault?
This code appears when the boiler is circulating water to dissipate excess heat after a hot water cycle has finished. While usually a normal function, it can become a persistent fault if the internal diverter valve gets stuck or the pump fails to stop when requested. This typically happens due to debris in the system water or a communication error within the electronic control board.
DIY fix possible
Wait up to five minutes for the pump run-on cycle to finish naturallyCheck that your external room thermostat or programmer is calling for heatPerform a simple reset by pressing the 'Reset' button if the code persists for more than 10 minutes
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