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Can you open the lock shield valve any further? Could be restricting flow on that radiator. Failing that, close both valves, drain the radiator, take it off the wall, flush it outside with a hose to remove the crap inside and refit. If that doesn't work, then get a plumber/heating engineer to take a look.
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Where is it in the system? Beginning, end, above, below?
Might just be imbalanced as @stevo_com suggests. If the flow can't be de-restricted further, you can restrict other rads in the system to force a higher flow rate. There's guides on-line for how to balance.
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I mean it depends how bad your heating system is, personally I think power flushing is a fuckin waste of time!
stevo_com
Howard
konastab01
@NickCJ
Is a central heating Powerflush money well spent? We have one rad that was noticeably cold over winter (despite bleeding) - is it a better idea to get that individual rad cleaned out somehow?