01 Supply Air Sensor Short Circuit (Check Alarm)

Thermo King Alarm Code

Description	Corrective Action
Supply Air Sensor Short Circuit (Check Alarm) Sensor circuit resistance lower than 200 ohms. Temperature below 80C (176 F). Indicates: Short circuit to left or right hand sensor Defective or wrong sensor Defective relay board Defective cable No.1 or cable No. 3 Defective controller	Identify defective sensor (left hand or right hand) by viewing Data menu. Check sensor resistance between pins 1 and 2 on plug J15 and between pins 7 and 8 on plug J14. Resistance must be 2,000 ohms at 25C (77F). Check cable No.1 and cable No.3 between the controller and relay board.