I have a Landis & GYR RWB2 programmer on my heating system, The timer on the original one stopped going round so I bought one off the internet and fitted it ( which was very easy to do) but this one is also not going round, the heating and water will come on if I set it off manually , I contacted the person that I bought it off and he said he had tested it before sale (I have no reason to not believe him) I was wondering if there was something I had to do before it would work? Any ideas?