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Ground floor at the front of house, boiler is at the back and CH pump is in the bathroom on 1st floor with megaflo etc.
Might have a go at cleaning it out myself based on these comments. Do I need to drain the whole system or can I just isolate the one I am removing?
NickCJ
konastab01
princeperch
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.