salus rt300rf

Hi just received the Salus RT300 to replace the aging honeywell T6360B. Thought the wiring was goign to be simple. The Honeywell appears to be wired: Earth - Green / yellow Blue - 2 Red - 3 Yellow 1 How does this correspond to the Salus wiring? Not sure why the current red wire is on #3 as...

This thing is a pain in the backside! Last year we had a new boiler fitted alongside the Salus RT300RF wireless thermostat and receiver. Earlier in the year it started not working but as it was summer that didnt matter too much! Now, its pretty chilly and its still now working...ive tried...