Hot water is good. Central Heating Flow pipe gets very hot, return is cold to touch. Boiler is mounted in cupboard upstairs, upstairs radiators get hot as does furthest rad downstairs, eventually. Big Rad in lounge not getting hot, no air in radiator. Distribution Pipework is plastic 10mm off manifolds fed by 22mm. Pump is turning when end cap removed but suspect not pumping - is only way to check to take out pump and strip it down ?

mitch27358, January 2011

sounds like the system needs balancing if the pump is working and other rads are getting hot. although your manifolds could be blocked that feed that part of the house. or you could just have an air lock.

chris, February 2011