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A frustrating day. First fitted my drawoff cock, (invoiced as a 1/2" Type A draincock, £1.19) There's a very good series of videos on Youtube from Plumberparts shows how to do it under "how to clear airlocks". Both replies mentioned airlocks and I needed to convince myself that I had flow into...

Can't see where the return actually connects, but I refilled the failing rad via the trv (return) and so it looks like the return can't be through the last rad on the circuit. I'm off to but a drawoff cock to connect in place of the bleed valve to make sure I've got a supply on both flow and...

Thanks for replyJeff. See para 4 in original. Everything off but this rad. No change. Also refilled rad after replacing through trv on return side and all filled ok. I would have thought that refilling rad should have cleared airlock.

I live in an "upside-down house", boiler on upper floor, problem with almost the last rad on the downstairs circuit. Combi/condensing boiler. Last week this rad became 'tepid' but the feed pipe to the rad was very hot (stoplock end), return, stone cold. First job, remove the head of the TRV...