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Inducer motor has to run the very first thing before anything else with the furnace can proceed.If that starts to move and quits, you need to trace wires from it back and test its source for 120 volts. If that is too hard to do, and you are handy with electric, you could snip the hot wire and neutral wire that run that inducer and test the wires leading back toward the controls for 120 volts when you run the furnace, and keep meter on it for about 90 seconds, to be sure that the relay has engaged.
And then you can also either hot wire the inducer to another 120 volt source, or ohms test the motor, if you are electrically handy. There could be a capacitor issue, possibly.
Before you attempt any of this though - THE very first thing I'd do is see if there is a way to try to spin the inducer motor shaft to see if it is bound up, when the furnace is turned off.
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