Air in system

[Tim2sheds]

We have a small bungalow with a pumped vented system but can't keep air out of the system, have to bleed the radiators every three days or so. The expansion tank has water in it, but the ball cock seems to be constantly trickling water to maintain the level.
There are automatic air removers near the tank one of which is mounted on a push fit tee but the pipe swivels in the joint although no water comes out.
One last observation there is a lot of verdigris on some of the pipes where they come through the concrete floor - are the pipes corroding and leaking - someone suggested that this is the problem?
Any advice would be gladly received as I fear we could be saddled with a big bill.

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Shocked

 

[chrishutt]

pipes where they come through the concrete floor - are the pipes corroding and leaking - someone suggested that this is the problem?

Sounds likely.

Turn off mains water supply to F&E (header) tank for a few hours and see what happens to the water level. Also look for damp patches in the floor. Leaks are most likely at joints - e.g. tee fittings under radiator branches.

 

[Tim2sheds]

Thanks. will try switching off and seeing what happens to the water level. There are no damp patches around any of the radiators. I presume you mean these (the tees) will be buried in the screed, but will be the cause of the verdigris.