Radiator system drained down in September 2010 to fit new circulating pump. Despite bleeding system umpteen times still getting gurgling noises and creaking noises from several radiators when heating comes on/goes off.

Old Codger, March 2011

i'm assuming it's a gravity h/water pumped heating system it may be that the system is faulty and if you've fitted a high performance pump (a grundfos 15/60 etc.) then the pump is still sucking air in try pump speed 1 if that doesn't work and it is air in the system then the expansion pipe may need altering or an air separator fitting

brian, March 2011

Pump is at 2 setting.

Old Codger, March 2011

check pump speed it only needs to be on 2 any higher and it will suck air into the system

brian, March 2011

Hot water radiator system linked by copper pipework to a gas fired convential boiler. Thermostatic valves on radiators

Old Codger, March 2011

what system do you have

brian, March 2011