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Thanks Cider - that was my fear! I can see that a switched live is coming from the Water Controller and into the Zone 1 'bank' and this doesn't correspond to the JG UH3 wiring diagram (it should be in the Time Clock bank). I did try and move the SL to the correct pin in the Time Clock 'bank'...

All, First post - so here goes. I've noticed that my UFH pump comes on when the hot water circuit goes live. Is this normal or should I sort it? I've only noticed it as have just come to fit the actuator valves (after a two years!) and thought it was strange that the UFH pump was running...