While adjusting the temperature on the dash, gently tap the motor casing. If it begins to move temporarily, the internal motor brushes or gears are failing.

Use a multimeter to check the harness connector for 12V power when the HVAC system is activated. Check the ground wire for continuity.

The plastic gears inside the actuator motor have stripped, causing the clicking noise and failure to move the blend door.

If you are in California or any state following CARB (California Air Resources Board) rules, pay close attention. The is often labeled as a "Large Spark Ignition (LSI) Engine." Before buying a used forklift with this engine, check the emissions label. The "-14" confirms it meets Executive Order U-S-XX for LPG. Without that label, you may not be able to bring the machine onto a regulated job site.

: This suffix is a sub-type indicator meaning "Circuit Short To Ground or Open". The "Story" of the Fix

The code is a diagnostic trouble code stored by the Nissan HVAC module. Specifically, it breaks down as:

: A wire leading to the actuator is severed (open circuit) or rubbed raw against metallic dash framing (short to ground).