Furnace control board wiring - swapped on adaptor?

Okay here's what to check.

The two wires have reversed colour, ignore the wire colour and compare it to the old connector and trace the wires back. If you can add photos of what component(s) the wires go to. The 4 pin molex I mentioned in the comments seemed odd because IGN = ignitor, IND = inducer, IGN N = ignitor neutral and IND N =inducer neutral. No worries, if the old one was like that it just means they picked up neutral of the neutral bank elsewhere.

edit

In DC electrical like cars, batteries and circuitry red is positive and black is negative. With line voltage red and black both indicate power. And HVAC electrical is a world all on it's own.

EDIT

I had a closer look at the diagram, there is one more component in there that could be causing the failure. There is a pressure switch called "front cover pressure switch" it has a grey wire and a brown wire one of which goes into the gas valve. I'm not sure what it looks like but it's in the schematic. It interrupts the gas valve power so if faulty, testing at the gas valve wires will give you a false positive on a board failure diagnosis.

Looking for this one

These are the flash codes