update on the previous post....
This was happening at my Mum's house after a new boiler and thermostat was fitted. She was calling me nearly every night saying the heating had turned off yet again. When I went to see the following day all was ok. I reset and resynced several times but she still said it wasn't working in the evening. In the end I went round when she called to say it was off again. When I arrived all I found was the room had reached the 'comfort' set temp so had turned off! Because the radiator was going cold she thought the boiler wasn't working and because she wasn't getting the radiated heat from the radiator she was feeling the chill. I raised the set comfort temp higher and hey presto no further phone calls. This problem sorted with a bit of education!!!
Linda T
January 2014