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What are the model and serial numbers?
This is a NEXUS unit. It is a bit complicated to troubleshoot.
The first thing I need to know is exactly what happens when you set the switch to MANUAL. How many crank cycles? How long is the pause between crank cycles? Does the unit just crank and not fire? Does it just fire once or twice and then stop? Does it actually start for a bit (how long) and then shut down?
Set the switch to OFF.
Manually move the stepper motor to the full closed position.
Set the switch to MANUAL, and note any movement of the stepper.
Manually move the stepper motor to the full open position.