Pinched VAV flow tubing can make the controller read wrong or not read at all. Lower/relocate the box enough to protect the tubing and replace damaged lines.
Do not force a VAV tight to structure and crush the control tubing just to gain ceiling space.
Check
Inspect the clear/pressure tubing from flow ring to controller.
Look for kinks, flattened spots, disconnected tubes, or reversed ports.
Check box clearance to beam/deck and hanger adjustment available.
Replace damaged tubing with a smooth route and no sharp bends.
Coordinate controls/TAB verification after correction.
Steps
Inspect the clear/pressure tubing from flow ring to controller.
Look for kinks, flattened spots, disconnected tubes, or reversed ports.
Check box clearance to beam/deck and hanger adjustment available.
Replace damaged tubing with a smooth route and no sharp bends.
Coordinate controls/TAB verification after correction.
Say this to your foreman
VAV [tag] has sensor tubing pinched against [beam/deck]. I checked the ports and tubing path. Do you want me to lower/shift the box and replace the kinked tubing before TAB?