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[/url] Indeed! the wiring diagram you sent the link to would have told me the answer immediately = but it is not the one that came with the instructions with the unit - how bizarre

There were 2 neutrals - twisted together and plugged into the same connector... dont know exactly why... but left them hooked together and sharing the neutral connector spot.... Thanks for your help :D

Indeed = that would work too! Thanks all for your very speedy help. l: :)

Ok - sussed it ! Had to put a bridging wire from second L connector to A - B is correct as switched live = all works now....

Ok - sussed it ! Had to put a bridging wire from second L connector to A - Stupid design if you ask me - and would have been soooooo easy to mention that L and A both need permanent live feeds!

I replaced my old Honeywell thermostat with a new CM927 today but... it doesnt work... Power light is on - remote thermostat turns unit on at right temperature, but boiler doesnt fire up... I have reinstalled the old thermostat in case I had blown a fuse somewhere but that works perfectly...

I replaced my old Honeywell thermostat with a new CM927 today but... it doesnt work... Power light is on - remote thermostat turns unit on at right temperature, but boiler doesnt fire up... I have reinstalled the old thermostat in case I had blown a fuse somewhere but that works perfectly...