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When I vent the two suspect radiators, cold water comes out at first, after some time the water coming out starts to warm up. It's the same for both the radiators. Would that mean that there could be a blockage on both of the radiator outlets?

Well, I now know that there was a problem with the pump, which, when fixed, solved the hot water problem and the radiators .... well 4 out of 6 radiators. What do you suggest the problem may be with the two raditors that are not working? One is upstairs and the other is downstairs. So...

Thanks Guys!!! I think we've got it sussed now, there are just two radiators that are not heating up yet.... I'll investigate further.

Thanks for the comment, any tips on how I could check or rectify a pump that is not circulating? Would this explain why the gas boiler runs for the first minute or two when I switch it on, before returning to the pilot light? Is there normally a pressure or flow switch fitted in the system?

I was away last week and came home to a cold house, where only two raditors upstairs were luke warm, the rest being cold. At that point the hot water was working ok. I have a Potterton prima B gas boiler downstairs with a Danfoss FP975 controller, a hot water tank up stairs where the pump...