Evaporator fan motor will not get voltage all the time in it's current state. It is probably in an error mode right now and waiting for service. You will need to clear out all the ice from the evaporator first and then start up the unit to check the fan motor. Check the defrost heater and defrost controller for continuity.
Check the evaporator fan and see if you can turn it by hand. If not, moisture has gotten into the bearing and has frozen the motor. You will need to replace the motor.