Bled the radiators and the pump and when running on C/H only the system is working fine.
However when the H/W is on the pump runs for a few mins and then starts making a noise. We switch the pump off and bleed it and all is well for a few mins until it starts again.
There seems to be air trapped in the H/W circuit. Is this normal? How long is it likely to be until all the air is out?
Is there any way of bleeding the H/W part of the system? I'm worried this is going to damage the pump.
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