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The fused spur is right next to the programmer. I checked the wiring for that this morning, there's a twin&earth feed which looks the same diameter as the feed into the programmer - and there's two other heavier t+e cables that suggest the central heating power is on the ring main and not...

CONTINUITY TESTING - HW OFF SEARCH: There are three twin & earth cables behind the programmer. One pair: Providing Live & Neutral for the programmer. Second pair: The brown wire goes to HW OFF, the blue is on the N terminal for the programmer. The third pair are providing CH (BLUE) and...

The pump has a white flex with BNE wiring. Neutral and Earth are wired into the block with all the others (boiler, programmer, valve and room stat). Just got to trace the other end of that blue wire and see if I have a wire I can use for terminal 1 HW OFF - which will then make it fully...

Terminal 3 on programmer definitely = RED in wiring centre (cable one) Terminal 4 on programmer definitely = YELLOW in wiring centre (cable one) Trying to track down a HW OFF wire now - I need to test the two blue wires connected to the programmer's N terminal. Thanks Colin

Hi, yes I tried this - after working out I had a pump overrun boiler I left the pump live connected to block three with the pump-live fed from the boiler. This leaves one other wire I tried (the blue one from the programmer) but it has no voltage. So I suspect the other end to that wire may be...

Thanks matt1e - have a look at my updated diagram; I've done some more checking and revised my labelling. I think the only thing I'm missing is a live from the programmer (HW OFF?) to connect to the grey wire to make sure it has voltage even when the heating circuit is off - to connect with the...

Hi Thanks for your advice - I've checked the wiring and found: I was correct which wires were from the boiler, thermostat and programmer. I made a mistake - the pump was connected to block 3 - Baxi Solo 2 has a pump overrun.:oops: I have checked the voltages from the grey and white wires...

Yes - as per my other reply just now I think I'll try that - given the understanding about the live feeds needed to the white/grey wire it suggests that the current controller works as it has two options - HW only which works - or CH but ONLY with the HW. When I turn the cylinder stat down to 0...

Thanks for that - helpeful information. Do you agree with my assumptions on which of the three unknown wires is linked to the boiler/room stat/programmer? I presume so. To check my understanding re. the live feed is correct - I need two live feeds to get the CH only function of the valve...

I was expecting there to be a mains supply in the airing cupboard but there isn't. I've described all the wires that are there. There is a LNE connection to the programmer - I'm not sure if it's correct but I was assuming that in that case the live feed should be transferred via the programmer...

Hi - hope someone can help. :) I have a three port Honeywell 4073a valve, cylinder stat, Honeywell room stat and Honeywell ST1250 controller. I tried replacing the ST1250 with a 9400c but can only get the HW circuit to work - no CH. (Note I got the info for the backplate change from...