the fan only comes on when you blow into the pressure switch then the boiler lights. but wont come on when you first turnon boiler or it cycles. could this be a pressure switch problem. old worcester 9.24
No one this site should be giving you any advice on this problem as it involves the combustion chamber which should only be accessed by a gas registered engineer.
The obvious advice is to get a competent engineer to diagnose the problem for you.
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