If the actuator runs but blades do not move, check linkage, shaft grip, set screws, blade binding, and access. Do not assume controls are bad until the mechanical linkage is verified.
Do not blame controls before checking whether the actuator is actually connected to the damper shaft/blades.
Check
Confirm actuator command and whether the shaft/blades actually move.
Check linkage arms, set screws, pins, shaft flats, bearings, and blade binding.
Use existing access if available
cut access only with approval.
Manually verify full open/close movement when safe and allowed.
Repatch/seal access and retest with controls/TAB.
Steps
Confirm actuator command and whether the shaft/blades actually move.
Check linkage arms, set screws, pins, shaft flats, bearings, and blade binding.
Use existing access if available
cut access only with approval.
Manually verify full open/close movement when safe and allowed.
Repatch/seal access and retest with controls/TAB.
Say this to your foreman
The actuator at [damper/tag] operates but the blades are not moving. I checked shaft/linkage access and possible binding. Do you want me to open access and reset the linkage, or have controls/life-safety testing verify?