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update thanks again gordongas went back and started from scratch and fit the wiring to the thermostat connections re-installed the sender and hey presto it worked. cheers.

Thanks gordongas i've tried both BUS and 24v neither seems to work, wondered if i should use the RT port on the power side ? although i dont want to blow anything.

hi i have a glow worm ultracom 2 35 CXI combi boiler and have bought a netatmo wireless thermostat. i have followed the wiring instructions but it's not switching the heating on or off. can anyone help ? i've tried using the BUS terminals as it states in the manual but nothing happens although...