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What is furnace model? The 50A50 usually only flashes up to 5 times.
I see a 6 flash on some of the boards that show 6 flashes as reversed polarity. Has any wiring be messed with?
The two reasons for reversed polarity error is if the hot wire is going to neutral and neutral to hot or ground is con connected good I have seen times when you could swap the 24v volt wires around and solve this