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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
WorcesterHeating, Home Heating SystemsWorcester Hot Working
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
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Mend repair fix Worcester home heating systems