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I'm an engineer, although in electrical appliances & steel design rather than gas installations. Read through any similar forum on here & you'll find many helpful suggestions not disregarding your above caveat. So the PCB, has anyone resolved similar by changing the board ?

I've been through quite a few of these forums hoping to track down my fault with varying levels of success. About 3 months ago the boiler started acting up, flame would could out early in the cycle with a flue fault being indicated. First thing I changed was the APS, at the same time I checked...