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  1. J

    Boiler firing up when programmer switched from on to off

    Hi, Hope you can help steer me in the right direction for this fault. So I have a gravity fed heating system, with a Potterton Profile boiler, Drayton Lifestyle LP722 Programmer and Drayton Combi-stat. (Also Honeywell 3 port valve). This has all been working well for a few years, however have...
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