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I have followed s-plan wiring diagrams found on the web. Also, the programmer is attached correctly. All connections apart to be correct except the L/N/E feed from the boiler to the wiring centre. These come from the Auxiliary Relay from the boiler. It is this live feed that is used for the...

I have a s-plan Heating system consisting of a valiant ecotec plus 637 system boiler, Joule cyclone unvented cylinder and Honeywell V4043 valves for hot water and heating. I have attempted to wire a Drayton LP522 programmer to the boiler to program the hot water but the display for the...

sorry guys - I got a little confused. The floor level is BELOW the dpc level.

The DPC is ABOVE the Floor Level (i.e. the Floor is BELOW the DPC).

I have a 1940 built house that has just been extended. The builder was contracted to build the extension and install wet underfloor heating (UFH) on the entire ground floor including the old part of the house. The original floor was floorboards over a void under which was concrete. During the...