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Yeah, I really think it must be the fan. but wouldn't the symptom occur straight from firing up cold instead of 5/10 mins after. Guess I should call in an engineer to check fan pressure before buying a fan. Thanks for the idea.

I've checked both tubes to APS and blown down them all appear ok. I've checked the casing gasket which is ok. I've put silicone on the grommets. I've got a restrictor on one of the tubes attached to the APS end so that's ok. I can hear the APS switching when it's tripping out the burner...

Thanks guys, really appreciate the advice will check it all tomorrow and let you know what I find.

My boiler fires up ok then after 10mins starts rapid tripping. The pilot light doesn't go out but main burner keeps tripping. An engineer changed the pcb and pressure switch but still no joy!? He reckons I need a new boiler! When I put hand pressure on the outer casing above the pilot window...