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looks like its the original DV valve. has 3 wires.

Thanks for the reply. I've had a look at the programmer and it tests ok (i'm not too bad with a multimeter) How would i check the syncron motor that you suggested it may be before moving onto a seized valve Alix

Hi All My first post on here. Wondered if you can help me on behalf of my parents (retired). I know this is an old boiler but it has chugged along with no probs and been regularly serviced. For the past week or so they have not been able to get hot water without the heating being on. Is...