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Yes, it seems it's been cobbled together to make it work in a way that the boiler isn't quite intended to! So if I were to remove the existing thermostat, froststat and LP241 and then install the junction box, I guess I would use the dry contacts to terminals 3 and 4 in the boiler? There is an...

I checked the connections in the boiler and it connects to Terminal 4. The 3rd wires go to a froststat and is just twin and earth. I picked up the junction box today ready to install.

Thanks, I agree it certainly seems to be a strange wiring configuration. Yes, that red is in fact brown, I typed it just referring to live! I'm not totally sure how the boiler fires when there is only one wire connected to 3 in the boiler and don't think anything was connected to 4? I'm...

That red is going to terminal 3.

The white sheathed flex goes to the boiler and only uses: Red - L Blue - N Earth - E White - 3 The 3 grey sheathed flexes go to mains, thermostat and possibly a valve, but I haven't been able to check that. The boiler manual mentions 2 or 3 port motorised valves.

The boiler only does heating, so probably no point in keeping the LP241. I'm actually thinking to replace it with a wiring junction box (https://www.toolstation.com/honeywell-home-10-way-junction-box/p51416) so the wires can be connected more safely. Thanks.

Got this boiler currently connected to an ACL lifestyle lp241 without a junction box and to an old Satchwell Thermostat. I have purchased a Ketotek ktf0155c which I have wired into other boilers at our local community centre and working perfectly, but wanting to clarify the connections to this...