Alarm 10 Thermo King can be described in the following table:
| Alarm 10 Thermo King Color: Red Immediate | Action Required: Yes High compressor discharge pressure (or temperature) If the unit shuts down, repair immediately. Otherwise, report the alarm at the end of the day. Alarm |
Thermoking Fault Code 10:
This alarm is related to higher than normal discharge pressure.
- If the fan is belt-driven, check its condition and tension.
- Inspect the fan gearbox for jammed or worn bearings.
- For electric condenser fan, verify voltage supply and motor behavior.
- Check for a defective 12-volt battery.
- A typical sign of a worn battery is if the unit loses power even before starting the engine.
- Inspect for a faulty High-Pressure Cutout (HPCO) switch. HPCO switch is located on top of the compressor.
- If the unit still doesn’t start, check HPCO switch voltage. Perform a voltage drop test to check for an open circuit. Trace the wiring circuit and verify fuses or switches connected to the circuit.
What to Do with Alarm 10 Thermoking?
In the following video prepared by CST Chilling Systems Training, some recommendations related to Alarm 10 Thermoking are presented:
- Operate the unit in Cooling mode and check discharge and suction gauge readings.
- If the system has a vapor injection for compressor cooling, operate the vapor injection valve to determine if it activates.
- Check the resistance of the compressor discharge sensor.
- The resistance in many Thermo King models should be approximately 86 kilohms at 25°C (77°F).
- However, check your equipment’s sensor type.
- Verify the discharge line temperature using a separate digital thermometer and compare it with the High-Pressure Temperature value displayed in the menu.
- The unit will operate normally without the compressor sensor. However, the compressor’s high-temperature protection from the controller will not be active.
High-Pressure Cutout Switch (Alarm 17):
Thermo King High-Pressure Compressor Switches The High-Pressure Cutout Switch (2) is located on the compressor discharge service valve.
If the discharge pressure becomes too high, the switch opens the compressor contactor’s ground circuit.
The compressor stops immediately.
Evaporator and condenser fans continue to operate normally.
The controller detects that a high-pressure cutout switch or internal protector has been activated.
Verification of the condenser fan is performed.
