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Worcester oil boiler; hot water on CH off, but CH keeps working?

I have a Worcester Heatslave oil boiler. the HW is on constant but when it kicks in to warm up the water, the CH also kicks in despite the CH being in timer mode and not due on
Jason B, January 2012
i'm an oftec engineer...lots of experience with heatslaves.
your boilers mid position motorised valve is faulty. replace the actuator head.

mark properjob, February 2012
link Click here to see other fixes for Worcester.