99 USDA 1 Sensor Open Circuit (Check Alarm)

Thermo King Alarm Code
Description Corrective Action
USDA 1 Sensor Open Circuit (Check Alarm)
  • Occurs during Pretrip (PTI) test only.
  • Container ID starts with MAE, MSF or MWC.
  • Temperature below -50 C (-58 F).
  • Indicates:
  • All 3 USDA sensors are missing
  • Defective cable No. 3
  • Check USDA sensors and sensor connections.
  • Check cable No. 3 between controller and relay board.

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