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  1. davemate23

    Navigating my central heating circuits and fitting 3rd Gen Nest

    Tried this and all seems to work well - pump starts up for both hot water and CH.
  2. davemate23

    Navigating my central heating circuits and fitting 3rd Gen Nest

    I’ll have to read the fine print and see. It’s fully wired into the Nest system now.
  3. davemate23

    Navigating my central heating circuits and fitting 3rd Gen Nest

    Yep! I have emergency breakdown cover, so best bet may be to wire it all back up and call them out for the boiler fault. Despite breaking the boiler, at least I can have some minor confidence that my (final) wiring was right!...
  4. davemate23

    Navigating my central heating circuits and fitting 3rd Gen Nest

    I don’t think so, the earth wires from the mains, boiler and thermostat were all wired in to one earth cable. When I first had a go with the Programmer wiring, I think I wired in the boiler without the pump and it may have just overheated the PCB or something.
  5. davemate23

    Navigating my central heating circuits and fitting 3rd Gen Nest

    Doesn't the HW have to come from the boiler? Connected the boiler to the pump and orange wire of the valve and the fuse blew again. I've now reconnected everything except the boiler and it seems to be clicking as you would expect and maintaining a live connection... so I guess it's got to be an...
  6. davemate23

    Navigating my central heating circuits and fitting 3rd Gen Nest

    I thought you had suggested it? Ah well. Pump works fine on it's own, I'll try wiring the boiler in-line with it and the orange valve and see what happens. I'm assuming this will blow it as the boiler is the only component left! There is a live connection through the cylinder stat, so it seems...
  7. davemate23

    Navigating my central heating circuits and fitting 3rd Gen Nest

    Thanks @AndyPRK - Yes, I meant voltage and hence no fuse blown. I've already removed the stat cover and checked. It's a Honeywell stat, so I have been using Honeywell's diagrams. There's still voltage to the system with the Nest and Valve reconnected, so just the pump and boiler attached. I'm...
  8. davemate23

    Navigating my central heating circuits and fitting 3rd Gen Nest

    Thanks @AndyPRK . I've just tried what you suggested - nothing happens, but there is a voltage coming through. I'm assuming that without the boiler powered and inline, then there shouldn't be anything happening, am I right?
  9. davemate23

    Navigating my central heating circuits and fitting 3rd Gen Nest

    I just tried switching the cylinder stat 1 & 2 wires (although I actually realised I had them as @EFLImpudence had suggested) - so this was now: 7 - valve grey cylinder 2 8 - valve orange, cylinder 1, pump and boiler L I said it was this way around before as (maybe I’m being an idiot but)...
  10. davemate23

    Navigating my central heating circuits and fitting 3rd Gen Nest

    @EFLImpudence thanks, and sorry yes - terminal 6 is HW on and 7 is HW off as you have rightly changed. Is the cylinder stat connected wrongly? According to the Nest wiring diagram C should be on HW on (terminal 6), 1 should be to HW off (terminal 7) and 2 should be to boiler/pump (terminal 8 ).
  11. davemate23

    Navigating my central heating circuits and fitting 3rd Gen Nest

    @ban-all-sheds i agree, but I didn’t wire that. I’m looking for advice on why the circuit is shorting and as I mentioned, once it’s functional i’ll replace the wires.
  12. davemate23

    Navigating my central heating circuits and fitting 3rd Gen Nest

    @ban-all-sheds as mentioned, the cylinder was wired with a brown, blue, yellow/green 3-core and those are the cylinder 2 and the orange wire from the 3-port valve. Is that not correct, or are you highlighting the colours? I’ve already mentioned that i’ll be sorting them once the system is...
  13. davemate23

    Navigating my central heating circuits and fitting 3rd Gen Nest

    @ericmark There’s a 3-core cable for the boiler and the mains though? The instructions for the valve are here and seem to state that the orange wire should be connected to the pump and boiler live as I have done. @AndyPRK ah ok, how do you think this would be shorting? The live is plugged...
  14. davemate23

    Navigating my central heating circuits and fitting 3rd Gen Nest

    @AndyPRK I’ve disconnected the thermostat, only connected the live and neutral wires to terminals 9 and 10 to supply the 12v DC for the Nest thermostat. By motor, do you mean the pump? What would cause this to short the system?
  15. davemate23

    Navigating my central heating circuits and fitting 3rd Gen Nest

    I’ve attached the photos of the junction box and another with the Nest Heatlink. I do plan to change the wiring colours once it’s all up and running - as mentioned, the cylinder stat needs changing plus a few others. I have the following: 1 - Live 2 - Neutral 3 - Earth 4 - Blank 5 - CH on...
  16. davemate23

    Navigating my central heating circuits and fitting 3rd Gen Nest

    @ericmark I’ve checked the mains and it was kicking in at 240v, and I checked the manual for the boiler and it specifies 240v so that shouldn’t be the issue. I disconnected the old thermostat, which was wired in using a 4-core cable, isolated two and have used the old Live and Neutral 0.75mm...
  17. davemate23

    Navigating my central heating circuits and fitting 3rd Gen Nest

    Don’t think I could if I wanted to now. There were a bunch of wires thrown into the spares block. It’s wired up exactly as is stated in the Nest manual - so guess something must be broken!
  18. davemate23

    Navigating my central heating circuits and fitting 3rd Gen Nest

    Hi all, I just bought a house and noticed the central heating wiring was a bit of a mess. I bought a Nest 3rd gen and thought it would be worth trying to sort it whilst fitting it into my new house - everything was wired straight into the old Honeywell ST7100 without any sort of junction box...
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