Myson Marathon 600B floor standing boiler gas leak

[Jock Spanners]

Evening all,

I've just traced a gas leak to a Myson Marathon 600B. The gas appears to be escaping through the flue. The boiler's a bit before my time but I know the valve was replaced fairly recently. Has anyone any idea how to fix it?

Thanks,

Jock

 

[ShaunCorbs]

Gas valve passing
Easy to test put tester on inlet and turn the gas off if it drops it's the gas valve

New valve or boiler