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Thanks for the quick responce Softus. The old valve was Honywell V4073A1062-7 it had BSP ports that had BSP to 28 mm converters in and an adapter plate on the valve head. I changed the valve to bring the system up to standard and the valve head wanted changing.The system has not been running...

Hi all, can some one give me some advice please, i have just fitted a new three way valve to my system and rewired some parts. it all works ok but the hot water comes on even when the programmer is turned off. i used a wiring diagram that came with the programmer and cross refereced it with...