There is no air pressure at the compressed air line in the booth.
- One or more booth doors are open. Close all doors.
- Faulty door limit switch. Repair or replace faulty switch
- Debris in solenoid valve. Remove debris.
- Solenoid valve not installed correctly (air flow direction incorrect). Install valve correctly. If compressed air has already been applied to solenoid, diaphragm is probably damaged and needs to be repaired.