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The boiler is giving fairly consistent s53 codes, so there's a blockage somewhere restricting flow.

Letting the air out hasn't made the heating any happier - it fired up at 5 flames, got to 70° quickly then shut off. It then came back on at 3 flames, ran there for a couple of minutes getting to around 64° then dropped down to one flame where it is now sitting. It occasionally tries to run at 3...

Here you are. My plumber (who by his own admission is not a heating engineer and did not realise that we had motorised valves that needed opening - this all started last year when he first drained the system...) went up into the loft just now and bled the left hand pipe on the third photo -...

Will do later on, thanks again

Thank you! Next daft question - how do I shift it?

Evening, Our system: glow worm ultracom 18hxi boiler, unvented under pressure hot water tank (possibly aquasystem?), a mix of microbore copper pipes and modern copper pipes. 10 radiators. We have had issues for the past year, British Gas have said it is because there is restricted flow...