Arrived to the customers location and greeted them in the lobby. Was taken to the roof and showed the equipment they are having trouble with. Found controls have no alarms or lockouts. System is set in free cooling mode and found outdoor air dampers working properly. System has a compressor running with a bypass solenoid causing compressor to continuously trying to start and stop. Found the ambient temp/humidity sensor reading 257 deg an this explains why compressor is trying to run in free cooling. Called aaon and was given number to a local supplier for part info. Confirmed with manufacturer sensor isn’t covered under warranty and will be email part availability w/ current pricing to quote our repair. Collected for time spent on job today. Left system breaker off at equipment.