3 out of 4 rads stone cold!

[Breaca29]

My downstairs radiators are working perfectly aswell as one radiator upstairs in the bathroom by the boiler.
I have bled all three radiators and cold clear water flows out. The tvr pipes are also cold but the ones on the opposite sides are warm.
Any ideas to help this problem will be greatly appreciated as both bedrooms and landing are freezing!

 

[kevplumb]

trvs are stuck closed

 

[Breaca29]

they are twisting away like usuall just not changing anything

 

[kevplumb]

cos the pins are stuck down remove the heads and gently pull them with a pair of pliers be gentle you could try twisting
if you pull the pin out you will only do it once

 

[Breaca29]

have pulled up pins they seem loose and rads still cold

 

[NiceChapPlumbingUK]

Expect u've solved it by now but...

Some Thermostatic Radiator Valves (TRVs) only allow water flow in ONE direction... Your TRVs could be on the WRONG end of the radiators, hence instantly blocking any water flow. They should be on the FLOW direction (water flowing AWAY from pump/combi) not RETURN direction.

NEED to swap TRVs over on the rads.
ELSE ditch TRVs and fit manual control rad valve.