radiator clicking

Q

quagga

Just one radiator makes clickety-clackety sounds. Air has been bled out of system and checked repeatedly. It's not bracket expansion - too loud and variable for that. Any ideas?
 
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If it's not air, I would guess TRV fitting wrong direction. Some are uni-directional and if on wrong way round the "washer" clicks near the shut-off point.
 
It's the one radiator without a TRV - open full all the time. It didn't do this until this winter, after about 7 years ok.
 

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