I've got a Potterton PRT100 stat in my lounge for the central heating and it never gets up to temp.
I know the house hasn't the best insulation but if that was the problem then the radiators would be on all the time and they're not, they turn off when the temperature gets to about 15 C (I know because I've resorted to keeping a thermometer next to the stat!).
There's no air in the radiators and when they're on they heat the same from the bottom to the top so they're not all gunged up.
Does this sound like a problem with the stat itself? If so does anyone have any ideas for a good replacement?
Please help...I'm freezing here!