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Thanks; I'll check how it responds in the morning when things have cooled down. As of tonight, the valve was moving from H to W when the heating stat was satisfied, but only if hot water on the programmer/timer was turned off. With hot water "on", the valve remained at H, even when the room...

Thanks for the quick response, which is very much appreciated. Sorry if I didn't explain things very clearly. What I don't understand is why the CH will not trip off when it reaches the room stat temperature if HW is selected at the programmer as well as CH, but will trip off if only CH is...

Hi there, About a week ago we lost hot water, but CH was fine. I just stuck the 3 way valve on manual override for a few days until I had more time to look into the problem. I've had the clip-on cover from the valve off and back on again and have fiddled around with the programmer to see...