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So you have thermostatic radiator valves and a thermostat?
It seems possible that your radiator valves are shutting off before you reach the cut off temperature at the room thermostat.
Normally you use TRV's to limit heat in rooms you don't need heated to the main level of the living areas.
If your thermostat is a new type it will have some sort of icon (like a flame) that tells you when it's 'calling for heat'. If that icon is on and the boiler is not firing up then the connection between the 2 might need resetting.
The fact that you can get heat out of the rads and adjust the trv's suggests the thermostat is calling for heat properly otherwise you wouldn't have heat at all.
Airhead
Guys, I have an unbelievably embarrassing question which no amount of googling can help.
I moved into a place about 6 weeks ago, it has a pretty new Worcester boiler and thermostat. All seems in good working order, the hot water and radiators all work.
However the thermostat doesn’t actually do anything. At my old place I’d just leave the radiators open, have the temperature set on the thermostat, and the radiators would heat/you’d hear the boiler flicking on and off to keep it at that temperature. But here the temperature I set on the thermostat doesn’t affect the radiators in any way - it doesn’t matter whether I have the thermostat off or set to 25°, or doesn’t control the radiator output in any way.
The only thing which affects it is controlling the individual radiators. So I have the radiators on now and it’s fine, but when I go out/go to bed I turn them off, but then obviously it’s freezing later and when I come home/get up in the morning I have to run around and turn them all on again.
I’ve read the boiler/thermostat instructions and they’re all very standard, it just doesn’t correlate to what I’m actually finding. Does anyone have any ideas or references I can check? I don’t need to do anything complicated, just want to be able to set the thermostat to keep the main rooms at a nice temp throughout.