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Thanks Terrence 7556 for your info. I think what we will do is get another 103 programmer, same as she has already. She will be happy that it is not broken even though I think she was hoping to get something easier to operate. Bearing in mind what you and docspock have said, I think we will replace like for like as she maybe would not understand the digital model. At least she will know how to operate the Danfoss as she is used to it. I will look on ebay to see if they have one. Good info about the backplate terence, I am hoping to do this myself when I visit her next week with the aid of my trusty DIY manual. If all else fails, we will call an electrician. Regards and thanks to you both.