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my boiler make's a knocking sound?

hi
my boiler make's a knocking sound when the central heating starts up i have checked all the radiators and none seem to have any air in them.
can you help me please

my boiler is an ideal classic lxff & ff
thankyou
kim, January 2010
Use this Fernox Boiler Silencer Superconcentrate 290ml.
If its not better in a few days call a service person.

cheers

Ian G, February 2010