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It works fine. Thanks a lot. Barry

Thanks gents. I think you are right. I have been working from an old Honeywell wiring diagram that doesn't have that wire because it is a diagram using a Randall 3060 which did not have an option of CH without HW. The wire you mentioned is missing. If putting the wire in doesn't fix it I...

System: Glow worm Hideaway Boiler (fairly ancient) 3 way valve Honeywell V4073A (Brand new) Controller TH-0471 (No temp control) (Brand new) Roomstat Danfoss TP5 (2yrs old) Cylinder stat Honeywell L641A (Brand new) My previous controller was a Randall 3060 which I have just replaced so...