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Hi folks, I have a defunct old style Danfoss FP715 programmer and need to replace it (Call for heat signal constant from programmer even when hot water off, CH side works fine). Having looked around I see that there is a Danfoss FP715si (I assume this is the modern replacement as it is almost...

Hi guys, I have a problem with our Grant 90 MkII Oil Fired Combi boiler in that there is only hot water from the hot water tap if the central heating is on or made to come on by turning up the room stat till it clicks the heating on. I tested the microswtich that is pressed by the pin...