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Thanks for your replies. Looks like I need to get someone in to possibly replace at least the cold feed and possibly a power flush.

Here are two pics. The disconnected cold feed you can see joining the 22mm? Old vent pipe just before in goes into the bottom of the pump. So that 15mm that you see is redundant.

Airing

Sorry, that last bit should read.... The cold feed goes down the old vent pipe and into the pump.

Odd. I've just loosened the compression cap off and water started to come out so I re-tightened it. On closer inspection the engineer has re-routed some pipe work! He has connected the cold feed in to the vent pipe. What I thought was the vent pipe that was capped off, is actually the...

Thanks for your replies. The boiler is a 15 year old Glow Worm Ultimate which has a thermostat that I've set in the middle. The pump is a Wilo Gold 50. There's a bit of sediment at the bottom of the header tank but can't believe that this is causing all this air in the system? So it might...

Hi A few years ago I had a problem with a noisy central heating pump. Air was rushing through pretty much constantly, gushing and whooshing is the best way I can describe it. I called a local heating guy and he said that the pump is possibly pulling air down the header tank vent pipe. He the...