04 Evaporator Coil Sensor Open Circuit (Check Alarm)

Thermo King Alarm Code

Description	Corrective Action
Evaporator Coil Sensor Open Circuit (Check Alarm Sensor circuit resistance higher than 100,000 ohms. Temperature below -70C (-94F). Indicates: Open circuit to sensor Defective or wrong sensor Defective relay board Defective cable No.1 Defective controller Low evaporator coil temperature	Check sensor resistance between pins 5 and 6 on plug J15. Resistance must be 2,000 ohms at 25C (77F). Check cable No.1 between controller and rela board. Check evaporator air flow.