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Thanks for the reply. After a few tries I managed to get it to work. I made a link between live and com and connected the black wire to the '2' terminal.

Hi all good people I have bought a wireless room thermostat, ESI model ESRT4RF to upgrade my old DRAYTON RST1. From my ICOS, ancient boiler, I have four wires, one live wire, one netral, one 'earth' and another wire that connects on the '3' terminal of the DRAYTON thermostat, first picture...