1, turn off power
2, open the battery holders on the room stat
3, turn power back on
4, press both the buttons, on reciever,at the same time and hold them together until the alarm light stops flashing (its red btw)
5, then hold the roomstat at least 1 meter from reciever and turn it so you have the screen facing you.
6, slide the right hand side battery holder back into position then do the same with the left hand one.
7, if you have a flame sign in the room stats screen then the alarm/recieve light on the reciever should start flashing then the green heating on light should come on.
if not repeat until it does