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Not quite the answer i was after. The valve doesn't stick, it turns constantly. is this a normal behaviour? Forgot to mention, it turns really slowly as well, can see this from the white slot head on the top of the valve motor casing.

Cool. Is this a normal sounding operation for the valve to continually turn whilst set to CH? If the valve has had it what is a suitable replacement actuator for it as I can't seem to find new Switchmaster units? Existing unit is a MIDI VA1, so my original thoughts were incorrect - it is a...

Having had a couple of issues over the last few days i have a couple of questions. Now the weather has gone to nice & warm i've turned my CH off, but the rads still heat up. Is this because the 3port valve rotates constantly? Its a blue switchmaster valve, Also my pump doesn't appear...