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The 6 flash code is an inducer motor fault. If the inducer was replaced and motor is running, it could be the hall effect sensor on the back of the motor that is bad.
I would first make sure the hall effect sensor was replaced (in back of the motor). If it was, then the board could very likely be bad.
A simple way to test: when you have 24 volts as measured across C or com to W (in other words a call for heat), the inducer should start immediately. If it does, but then you get a 6 flash code (inducer fault), make sure the hall sensor is good and has been replaced. If the inducer does not start right away, it may be a bad board.
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