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How can I stop one of my radiators tapping when the central heating comes o?

One of our radiators makes a tapping sound when the central heating first comes on in the morning. What could be causing this and how can I stop it ?
John Hyslop, December 2007
the radiator brackets should have small plastic anti vibration clips on the hooks where the rad sits,if not it will be metal to metal causing the tapping,local merchants may have some.

rich, January 2008
have you bled the air out of all the radiators? that might be causing it

Bob, December 2007