sorry I don’t understand ‘no wiring needed’. If I undo the screws the front comes off and the wiring is in this part so would have to be undone and the whole box removed and new one wired up. The new one looks so different though inside yet the new thermostat is exactly the same as the old one...
My RT500RF thermostat has stopped working so I have bought a new one.
I’ve set the 12345 code to be the same on the receiver and the new thermostat. I just can’t get the new thermostat to talk to the original receiver. I carefully followed advice and steps from a post last year on pairing but it...