Alarm Code Descriptions
Color Code Definitions
| OK TO RUN | CHECK AS SPECIFIED | TAKE IMMEDIATE ACTION |
| Alarm | Description | |
|---|---|---|
| Manual Start | ||
| OL |
Electric Motor Overload (Electric standby models only) - The electric motor overload relay has tripped due to excessive current draw. If the problem persists when the unit is restarted, contact your Thermo King Dealer. |
|
| 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 and has protected the compressor from an abnormal condition. Unit operation will resume automatically once the normal suction pressure is restored, and the alarm can be cleared (see Clearing Alarm Codes). Among other reasons, this could be due to:
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, tP4 | Thermal Protection Alarm - If the problem persists when the unit is restarted, contect your Thermo King Dealer | |
| 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. |
|
| C |
Communications Failure Contact your Thermo King Dealer. |
|
| H03 |
SCM communication lost - Communication lost to Smart Charger Module. If the problem persists when the unit is restarted, contact your Thermo King Dealer. |
|