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i can only get 1 radiator hot all have thermostatic valves on them the pump is ok all radiators are on the same level when i switch the kitchen one off (the only one that works ok) the bathroom one comes on the thermostatic valves seem ok in that they are not stuck down could this be a air lock...

all radiators except 1 nearest the boiler are cold they all have thermastatic valves on them there was some air in the one that was working i bled it and is now ok bled the rest of the radiators but found no air in them but they are stone cold all radiators are on the same level