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Hi The thermometer is a mercury filled one. It is correct. The baby monitor also says the temp is same. Thermometer next to stat on wall in hallway approx 1m60cm. Am beginning to think there's a logical explanation. Thanks for all your suggestions/comments today. I'll leave it there on this...

No, It's in a hallway. It has worked for years just fine, yet didnt recently, so was replaced and problem persists.

One further point, this happens regardless of having the boiler on or off. ie, with the boiler on, the stat will call for heat at 23ish degrees. With the boiler off, I can turn the dial past 23 and the stat will click in to call for heat. It works in the same way as the previous stat did. My...

Hi I wired the NEW stat in exactly the same way as the OLD stat. The backplate is the industry standard type as before. The OLD stat was working last winter, but didnt recently so was changed for a new one. The problem hasnt gone away. Live, Switched Live, Neutral and the parked earth are in...

Not sure. Will have to ask the person who serviced it if they touched the stat/connections.

Hi Control knob not removed. Just new backplate fitted and wired in as before. The problem was there with previous stat, and persists with this one.

Hi Sharpend, thanks for replying. All rooms/bedrooms have TRV's on the (apart from the control one in the hallway where the stat is located) They seem to be working fine. Cold air will set the stat on, but still will not reach below 23. It's clearly not that temp. Am at a loss to think what...

Hi all. Have come on here for some help and advice. My room stat, working fine last winter, thinks that the room it was located in (hallway) is 23 degrees (thermometer says currently about 16 degrees). Consequently I cannot set the stat to call for heat from the boiler if it drops below 23...