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Thanks, that worked a treat :D I'm off to buy a new programmer now. Thanks Rod

Hi, I suspect my Landis & Gyr RWB2 Programmer to be faulty as my HW is working fine but I have no CH. I have tested the room thermostat, pump and 3 way valve which are all working fine. Does anyone know which contacts I can short on the backplate to bypass the programmer and see if the CH...