Just noticed our bathroom radiator is cold. Single level house, combi boiler, we have hot water and all other radiators are fine. Have been nailing plywood into floor of bathroom but used very small nails and i am sure i havent hit a pipe, there has been no pressure drop in the boiler. Radiator in one of the other rooms is off the wall at the moment, could that be affecting it in anyway? Have drained bathroom radiator and get and there is no air left in. Thanks in advance