Alarm Code Descriptions
Color Code Definitions
| OK TO RUN | CHECK AS SPECIFIED | TAKE IMMEDIATE ACTION |
| Alarm | Description | |
|---|---|---|
| Manual Start | ||
| bAt | Low Battery Voltage - Check vehicle battery. | |
| Auto Start | ||
| HP |
High Pressure Alarm - The system has detected excessively high discharge pressure. If the problem persists when the unit is restarted, contact your Thermo King Dealer. |
|
| LP |
Low Pressure Alarm - The system has detected excessively low suction pressure. If the problem persists when the unit is restarted, contact your Thermo King Dealer. |
|
| PSE |
High Pressure Sensor Failure - The high pressure sensor has become faulty or disconnected. Contact your Thermo King Dealer. |
|
| tEP | Thermal Protection Alarm - If the problem persists when the unit is restarted, contact your Thermo King Dealer. | |
| tP4 | CPM error - See CPM LED for alarm and/or Diagnostic tool. | |
| dr1, dr2 |
Cargo Doors Are Open (Units with door switch option only) - Check if the Doors are open. if not, then the door switches are faulty, or improper door switch configuration. Contact your Thermo King Dealer. |
|
| tCO |
Control Module Overheating If the problem persists when the unit is restarted, contact your Thermo King Dealer. |
|
| SOF |
Software Failure Contact your Thermo King Dealer. |
|
| P1E |
Faulty Cargo Box Return Air Temperature Sensor - Faulty or disconnected return air temperature sensor. Contact your Thermo King Dealer. |
|
| P2E |
Remote Cargo Box Return Air Temperature Reading Error (open circuit or short-circuit) Contact your Thermo King Dealer. |
|
| C |
Communications Failure Contact your Thermo King Dealer. |
|