Hi . does the hot water work?
Yes, it seems to be working OK. The setting on the programmer is set at 'on'. so it relies in the tank thermo to fire up. I have only just switched the CH on and that's where the problem seems to occur
Hi . Nigel sounds like the recieved unit of the room stat is faulty. If it looks like it is switching on and off but not working it means it has failed internally and needs replacing.
But I wondered why the heating side does not work when switched to ADVANCE. Doesn't that over ride the room stat?
No .it just overrides your programme start times