00 Supply Air Sensor Open Circuit (Check Alarm)

Thermo King Alarm Code

Description	Corrective Action
Supply Air Sensor Open Circuit (Check Alarm) Sensor circuit resistance higher than 100,000 ohms. Temperature below -70C (-94F) Indicates: Open 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. Check evaporator air flow.