I have just bought a house which has central heating and all but two of the bedroom radiators are working. I have a Baxi combi boiler and also a hot water tank (not sure what this is for). The Central Heating System has Feed and return pipes. I have noticed that for the two radiators that don't heat up, even the copper pipes leading up to them are always cold (even when the central heating is on). I am not sure if the thermostats are not working, or if theres a water feed problem to the radiators. Any suggestions would be appreciated.