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Mend Ideal Classic LFF & FF Boiler Makes Sound

My boiler makes 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

Ideal Ideal Classic LFF & FF Heating, Home Heating Systems Boiler Makes Sound

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Ideal Classic Boiler Knocking - Help & Advice