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Sorry to fire this back up again, but I have a further problem - the hot water, while hot, isn't as hot as it used to be. Before I couldn't hold my hand under the hot water tap without scalding myself... now I can leave my hand there forever no problem. Also when I tell the nest to boost the...

As it turned out, I don't have a Neutral so have decided to wire it in via a fused spur from a socket further along the wall.

I know, totally agree it's not ideal it's just going to save me such a headache running cables from elsewhere. When I next decorate I will 'do it properly' but should get it working as I want for now. I won't have a plug there or anything, it will literally go from switch to transformer...

Yes I understand that - but to keep the thermostat where it was I can't run wires all the way back to the heatlink without ripping up floorboards and plasterboard. So, I need 12v - therefore could I, technically, spur off the nearby light switch and connect a 240v - 12v transformer between that...

I left the wiring in place - I just connected together and ran the live into the call for heat on the heat link. I left the wiring centre under the pump alone. I guess it gets all the power it needs when the heat link calls for heat. My only issue now is the Nest Thermostat not being on the...

Thank you so much! It works! Really appreciate it.

OK - there is a wiring centre under the pump in the airing cupboard. 95% sure that's where the other leads on the thermostat are going, as there is no power to the pump when I isolate the power at the programmer. So, am I right in thinking if I join the Neutrals together, join the Lives...

Excellent advice so far, thank you. Will one of the Neutrals will also go back to the programmer? I am also guessing that the live out to central heating and the other neutral possibly go to the motorized valve ? Will this be likely in the airing cupboard ?

OK, so I also found the wiring diagram: Thermostat Wiring Diagram by MrMoo123 posted 1 Dec 2016 at 11:34 AM

Ok so this is the Thermostat: Thermostat Front by MrMoo123 posted 1 Dec 2016 at 11:04 AM And here is the wires:Thermostat Wires by MrMoo123 posted 1 Dec 2016 at 11:04 AM Just for clarity, this is how the programmer was wired Controller Wires by MrMoo123 posted 1 Dec 2016 at 11:04 AM I can't...

Ah yes, I did receive that thanks. Makes sense now! On the thermostat side of things - are the 2 mystery wires for the Thermostat? Are these the ones I would need to join together? Any ideas where the other 2 wires might go? Could I in anyway use the existing cabling for the new thermostat ?

OK Thanks for this. However, I am a bit stuck on step 5. Do you mean run a wire from L on the heat link into both 2 & 5 ?

Morning, I am about to install a Nest Thermostat (3rd Gen) and after looking at what I currently have, there's a couple of queries. Issue 1: Current Controller has N L 1 2 3 4 and is wired as follows: N - 3 Wires: 1 is from the fused switch, 1 goes to the boiler and I have another mystery...

Recently installed a new bathroom and had a few problems when it came to installing a new mixer shower... basically the cold is main fed throughout the house, we have no tank for the cold... so initially the cold was overpowering the hot water feed.... got it all sorted out using seperate...