How do I set up the Climapro 2 Rf to link with my boiler?

Does anybody know how I can set up my recently purchased Climapro2RF wireless system to my Glowworm Ultracom 2 35 CXI boiler ? The manual states that the Unit and RF receiver should be already
paired up but mine clearly isn't ! All my connections are wired up correctly ( there is a green light on the receiver so i know this s wired up right) but the Remote unit and the receiver are 'talking' to each other. There seems to be what looks like a reset button on the reciever but there are no instructions on the manual to say what to do in the event the units do not communicate. Can someone help plaese. Thanks.