Hi i have recently had a wirless drayton 30002 fitted and i am wanting to set 2 temps hi and low and when i first got it this worked fine - now it wont set them and keep them set - i set low to 18c and hi to 23c and when i finish programming it it shows completley different settings like 19c and 20c - i am doing to the book but keeps failing - any help please i am new to this not up to date thanks ?