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Cheers Kev, A further question,I have just drained the system & started to refill but water is coming out of the aav & falling inside the boiler again,there is a screw on top of the aav but the manual says to leave this loose?

Potterton combi 80,recently changed the main PCB board as the old one fried the top left part of the circuit board.All fine for few weeks until it wouldn't start up(lockout out light was on)tried reset but no luck. Opened her up & noticed water everywhere :shock: dried her out with hair dryer &...