Alarm Code Descriptions

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.

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:

• Dirty evaporator coil – excessive ice formation.

• Load stacked in front of the evaporator does not allow proper air recirculation through the box.

If the problem persists when the unit is restarted, contact your Thermo King dealer.

High Pressure Sensor Failure - The high pressure sensor has become faulty or disconnected.

Contact your Thermo King Dealer.

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.

Control Module Overheating

If the problem persists when the unit is restarted, contact your Thermo King Dealer.

Software Failure

Contact your Thermo King Dealer.

Faulty Cargo Box Return Air Temperature Sensor - Faulty or disconnected return air temperature sensor.

Contact your Thermo King Dealer.

Remote Cargo Box Return Air Temperature Reading Error (open circuit or short-circuit)

Contact your Thermo King Dealer.

Communications Failure

Contact your Thermo King Dealer.

DSR communication lost - Communication lost to the other Electronic Control Module.

Contact your Thermo King Dealer.

HMI communication lost - Communication lost to the HMI.

Contact your Thermo King Dealer.

SCM communication lost - Communication lost to Smart Charger Module.

If the problem persists when the unit is restarted, contact your Thermo King Dealer.

CDM communication lost - Communication lost to Compressor Drive Module.

Contact your Thermo King Dealer.

Low Power Mode Activation - ignition key of the vehicle is disconnected, and the unit is not connected to the shore power. Operation of the unit may be inhibited but remains operational.

Report Alarm at the end of the day.

Sleep Mode Activation- While the unit OFF, the vehicle battery voltage dropped below a threshold. Normal operation of the controller will resume as soon as the power is restored.

Report Alarm at the end of the day.

Power Derating Shutdown - Low Voltage Shutdown alarm - your battery voltage has dropped below a defined level. The shutdown alarm is automatically cleared once the voltage rises over this limit once more.

Contact your Thermo King Dealer.

Internal flash erase error - Internal, System reset needed

Report Alarm at the end of the day.

Default parameters in use - This will typically happen after a new firmware version has been loaded.

If the problem persists when the unit is restarted, contact your Thermo King Dealer.

eMMC erase error - An error occurred while loading parameters to the DSR-IV Controller.

Internal, System reset needed, contact your Thermo King Dealer.

eMMC write error - An error occurred while loading parameters to the DSR-IV Controller or performing the datalogging process.

Internal, System reset needed, contact your Thermo King Dealer.

eMMC read error - An error during powering-up when reading configuration paramenters.

Internal, System reset needed, contact your Thermo King Dealer.

Flash Loading Failed - An error occurred while loading firmware to the DSR-IV Controller.

Internal, System reset needed, contact your Thermo King Dealer.

Non-Compatible SW - Indicates that one of the electronic components contain an incorrect or out-of-date Software version.

Contact your Thermo King Dealer.

Phase overcurrent- Shutdown alarm

Contact your Thermo King Dealer.

Overcurrent of DC/DC converter- Shutdown alarm

Contact your Thermo King Dealer.

Input overvoltage - Shutdown alarm

Contact your Thermo King Dealer.

Input undervoltage - Consider let the engine run to allow the alternator to charge the vehicle battery.

Contact your Thermo King Dealer.

Motor Endstage temperature too high - Shutdown alarm

Contact your Thermo King Dealer.

Motor controller communication error - Critical, Motor controller alarm

Contact your Thermo King Dealer.

Locked Rotor - Critical, Motor controller alarm

Contact your Thermo King Dealer.

Compressor start-up failure - Critical, Motor controller alarm

Contact your Thermo King Dealer.

Phase Loss - One of the phases carrying current to the Compressor Drive Module (CDM) is disconnected.

Contact your Thermo King Dealer.

CFLT activated - Repeating non-critical alarms or a threshold of Active Alarms is reached which forces the unit to shutdown for maintenance.

Contact your Thermo King Dealer.

Battery internal alarm (Thermal or Voltage problem) - Shutdown alarm

Contact your Thermo King Dealer.

Battery communications lost - Shutdown alarm

Contact your Thermo King Dealer.

Low Battery warning. - Please connect your unit to shore power to charge the TK Battery.

If problem persists, Contact your Thermo King Dealer.

Battery internal alarm (internal sensors) - Shutdown alarm

Contact your Thermo King Dealer.

Battery deeply discharged. - Please connect your unit to shore power to charge the TK Battery

If problem persists, Contact your Thermo King Dealer.

BMS communication lost. - Restart the E-200.

If problem persists, Contact your Thermo King Dealer.

SCM Charging Condition. - Restart the E-200.

If problem persists, Contact your Thermo King Dealer.

Over Temperature in the Power Supply Unit (Main Unit) - Let the unit cool down, then restart the unit.

If problem persists, Contact your Thermo King Dealer.

Relay Malfunction - Shutdown alarm

Contact your Thermo King Dealer.

Batteries current imbalance warning (2 Battery Application ONLY) - Connect the unit to shore power to charge the TK battery.

If problem persists, Contact your Thermo King Dealer.