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Thank you - thanks for the confirmation. I now know I have an S plan system. As I mentioned in the original posting I have "One 2 port Sunvic LSZ2301 in a plastic case and the other a Honeywell V4043H1056 2 Port motorised valve in a galvanised metal case, but not aware which is HW or for...

Thanks for your response. The boiler is certainly 8-10 years old, maybe more. My issue is that the pump will remain active for hours after last programmed call for action. Is the 3 port valve actuator normally part of the boiler? The other 2 valves (2 port) I have are next to the HW Cylinder

Do you believe that the motorised valves sticking is the cause of the pump staying on? If so, is there a I can identify which one of the valves is sticking?

I have a unvented CH & HW system Boiler is Ideal Classic FF260. The whole CH and HW system has been working fine, both activating and deactivating on timed control and through room thermostat. I now have an intermittent issue where both HW and CH can be off on the timing programmer and yet the...