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Thanks for that. The pump was on full for a while while clearing all air, now that its all bled its quite on all 3 settings, but its now running on 1 and quiet and warm.

OK, an update and thanks for all your help. The noise was air bubbles trapped in the pump that I could not get rid of permanently no matter how much bleeding I did. It would go then come back. It would move around the system then settle in the pump. The radiators acted like speakers...

After bleeding the pump and radiators should the bypass valve be open closed or something in the middle and how to find the middle point ?

OK, Found a drain point downstairs under a radiator, connected some hose to it and opened the valve. Warn water started flowing, so I run into the roof space and could see the filler tank only half full and filling from the ball valve. I guess this means the cold water feed is working...

Thanks, Good point. Would this be a good test ? I will turn off isolating values each side of pump, remove the pump and open the top valve to be sure lots of water comes out into a bucket and check the tank is filling.

Hi I hope somebody can help. Sorry if I get some wording wrong as I'm not a plumber. Each time the central heating pump starts in the upstairs cupboard we can hear rushing water noises for a few seconds then it goes and the system is quiet. Sounds like lots of air in the system. I have...