Up/Down Vane Does Not Operate At All - Hyundai HSH-I073NBE Service Manual

3.4 Up/down vane does not operate at all.

If a constant torque is felt when rotating vane by hands,
the assembled condition is normal.
At the moment the blower is stopped, up/down vane auto
switch is stopped, and if blower is started, auto switch is
re-operated.
- Especially, it occurs while dehumidifying or heating.
Air Conditioner Service Manual
Vane bending, structures
interferance check
Motor shaft assembly check
Connector check
(Disconnection/short
circuit/malconnection)
Blower operating condition
check
PCB ass'y check
Step motor driving circuit
77