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Thanks for your help Oilman. Thats put my mind at rest :D

Sorry Oilman Boiler is An Ideal W getting on a bit now. Grundfos 3 speed pump fitted that seems to be working correctly. I guess its a sealed system but not too sure. I'll try and leave the sledge hammer out if you think that won't help.

Hi hope someone can help me. Our wall hung boiler started making a banging noise which after a few days turned to a noise a bit like the shooting on space invaders. I have bled the radiators and added fernox boiler silencer. But the noise continues. I have no idea what to try next but the...