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For the benefit of posterity (that is anyone else trying to extend the life of a Stateman Flowsure Boiler but without the ineffective plate heat exchanger) my efforts are now up and running. With the S-Plan plumbing complete (CH Zone Valve, DHW Zone Valve and to replace the original Diverter...

Had some time to look at the wiring and "guess" at what the relay is doing to the CH "call" and HW "call" wires. Looks like I was hunting in the wrong place for how the Flow Switch closed the Diverter S/L - I think that it achieve the same effect by actually cutting the Diverter N between...

Thanks but no rush - the heating's back on now which was the original pressing need

The intention was to get round to that a bit later - but with the Flowsure having blown a fuse and out of action, life was a bit chilly - and an S-Plan "kit" is easy to source as (theoretically) a quick way to get warm again, rather than shelling out (and waiting) for a Baxi/Myson special -...

I am currently specifying a system that will provide back-up CH/DHW to a proposed solar thermal installation. The current boiler setup is W-Plan (CH-ON powers the valve giving CH only, 3-wire Cylinder Stat "call" cuts CH-ON power to diverter and diverter goes to DHW only). The Solar DHW...

Might still need my crayons - while (still have just noticed that the Potterton System wiring diagram has an arithmetical error - the diagram clearly shows the zone valves feeding into a 7-terminal junction strip, while, on the same diagram (bottom right) the boiler terminal socket to which it...

Thanks

Thanks for the additional information. I have managed to locate the wiring diagram you referred to earlier - page 29 on: http://www.acwilgar.co.uk/Boiler-Manual-PDF/Potterton/Statesman_System_L-Flowsure_L-FlowsurePlus_L_Install.pdf For those that want to see it, I will (try) to attach it...

..... My experience with electricians and central heating controls has been mixed. If they have a manufacturer's "standard" wiring diagram it's OK, but I have found that, for example their knowledge of what's actually going on inside the zone valves can be limited, so my crayons may well be...

Many thanks for that - sadly, the "Installation Instructions" that came with the boiler is a "booklet" rather than a manual and only includes the one Flowsure wiring diagram - for the way Baxi designed it as a combi - no alternative diagram for use as a "system boiler" - which I assume has a...

Has anyone got a wiring diagram for this?

I have had the same sort of long running problems with the DHW side of a Potterton Statesman Flowsure (not the "plus") as many others and have decided to take the advice of Gasguru from some years back and take off the plate heat exchanger and re-configure the boiler as a conventional S Plan CH...