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Thanks very much. So it would seem as if there is another problem. I heard a pop from under the stairs where the timer is located. The old unit was dead no display or anything. When we replaced it everything seemed ok at first but when we checked the boiler it was not working. The thermostat...

:?:

My CH/HW Programmer unit for my boiler has given up the go. The old one is a Danfoss FP715. I have tried to replace it with a sunvic 207 xls doesn’t work On the instructions it says it is compatable with the Danfoss FP75, FP15 the CP75 and the CP15. Obviously until I have got this one home...