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His company has always used electricians and he's been a plumber 15 years and is more than capable.. think that post was pointless to be honest mate. He just wants to be careful which is better than the gung-ho wire it any way that i've seen on some posts on here!!! If ya can't be helpful...

This seems to be getting more complex the more replies i get volt free or not volt free, that is the question...? :wink: Will i blow any fuses on the boiler if i get this wrong or will it just not work and i jump 3to4 on the pcb again to sort things out???

It is for a combi, I bought a new-build house and have the exact same stat on my combi at home tho??

So 3 to 3 and 4 to L ? Is that right???

I found the manual and wiring diagrams online, brother-in-law fitted the boiler (he's a plumber) but is worried about wiring the thermostat in case he pops a fuse... Seems pretty straight forward to me 2 wires to connection 3&4 only problem being which way round??doesn't seem to tell you in the...