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Update - after Ian's advice, re-visited. Double checked the boiler manual to confirm that the power supply to the junction box originates from the boiler, with the addition of a switched L. Got my hands on a 3 pole, 3amp fused isolator switch and wired it all up, ensuring that both the...

Yes, sorry what Ian said was spot on. Apologies for not being clear. The system is turned off now fully, and wont be coming back on again. The only supply to the old junction box consisted of a 3 core, plus earth - from what I could determine, 1 of the wires was the switched live from the...

I cracked it! - well, kind of. Was getting feedback from the fused spur I had installed, as it was a 3 core + earth into the fused spur (so doubled up on the L-in / L-out connectors). This caused the boiler to fire as soon as the mains was turned on and the pump to kick in as soon as the fused...

Thank you Stem- am going to dig deeper in daylight and will let you know how I get on. I owe you a pint or 2 one day. Turns out, I mispoke, it's a 3 core + earth - going to try an isolator switch above the fused spur, as makes sense in my mind.

Update thanks @flameport & @stem for your advice. Today have managed to remove the old system, isolate and remove the old thermostat and re-wire the system and install a 3amp fused spur switch. All went well and no "pops" or "bangs" along the way. I had a bit of a sticking point where there was...

Thanks @stem - guess I am going to have to replace the junction box and rewire the lot. I've ordered a Drayton LWC1 wiring box and a fused spur switch. Will give it a go this weekend and remove the old thermostat and wiring. Sure the wife will be happy to have that eyesore off the wall! Cheers...

Hi @flameport & @stem, many thanks for the advice - didn't even consider replacing the junction box. Had a look and seems easy enough with an install of a fused spur and a Y-plan wiring centre. Ordering the bits today and will see how I go this weekend. Thanks again for all the help, really had...

Hi Stem, Thanks for coming back to me and what a find that diagram is! Thanks! Looking at it though, I think I am right that the HW Off wire should be originating from port 18 on my Relay Junction Box - by my system doesn't have a wire coming out of this. I have wires coming out of the relay...

Hi everyone, long time reader, first time poster. Need some advice please. We have an old heating system - Baxi bermuda back boiler (serviced every year and running fine), hot water tank, pump and 3 port-valve in the airing cupboard. I believe it's a Y-Plan set up. Couple years ago, upgraded...