On a call for heat you should be getting 24-28 volts on the white & blue wires in the junction box where the thermostat wires come in the unit. If you are getting 24-28 volts there then it is something in the unit if not then it is external of the unit. I would check that first and report back.
FYI
It looks like you have an EEM motor in that unit. That is basically a 3 phase brushless motor that has 5 speeds depending on what 24 volt wire is energized on the terminals 1-5 on the plug on the motor.
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