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The problem is the relay that brings on the motor which is on the circuit board is shot. You need to replace the circuit board.
If you have a multi-meter, cycle the furnace with no motor leads on the heating terminal on the circuit board. It should show 120 volts after 60-90 seconds. If no voltage is present after that time that tells me the board needs replacing.
You have proved by turning the fan on and changing speeds that the motor is fine.
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80 911 SC sold
17 Tahoe
07 Z06 Corvette
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