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To me, this issue sounds like a bad control board. However I would need some additional testing done by you to help.
I need you to obtain a voltmeter, set to volts AC and check for voltage to the blower when in heating mode. Usually this will be tested at the board across the red lead (probably on a terminal marked "heat") to a white neutral. We should read 120 volts AC after the burners have been on a while.
Did you have voltmeter set to "volts AC"?
If no voltage when blower should come on, replace the board.