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For some reason I read your reply to mean you were saying a 13A fuse might be causing the problem instead of the programmer being faulty. Seems even a 3A fuse doesn't prevent that. It was a short in the Tank stat that was the original cause but it appears it took out the programmer before the 3A...

No its 3A but why would a 13A fuse in the main supply cause the programmer to show Hot Water call to heat to be on permanently? Excellent Thanks.

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...

lol, fair enough JW. Anyone else like to help me in my quest for knowledge?

Ok cool thanks, that makes sense. Just so I understand the mechanism here, does that mean that the diaphragm and valve mechanism are joined and because the valve is only moving half way thats why the pin only comes half out? What makes the valve move? Is it purely the water pressure...

Thanks dcawkwell, Do you know how the diverter valve internals link to the diaphragm if at all? I have investigated the pin movement a little further and it does push in and return to the correct position and it pulls out further (with the help of a pair of pliers) than it moves when you...

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...