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Thanks for your response, there is no marking in the controller, however I was told that it is Landis & Gyr RBW2.

Hi, my central heating programmer is very old and part broken. It is a Glo Warm boiler " Landis & Gyr" type controller with seperate heating & hot water controls.( Alalogue Type ) . I was told that " Siemans" controller will fit without changing the back plate ( thus touching any...