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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, February 2010
check pump not working so water not circulate and boiler is overheating if sound comes after a while than scale in the boiler

mr K, February 2010
Sounds like air in the system...Try bleeding your rads.

CHUM, February 2010
link Click here to see other fixes for Ideal Classic LFF & FF.