56 Compressor Temperature Too High (Shutdown Alarm)

Thermo King Alarm Code

Description

Corrective Action

Compressor Temperature Too High (Shutdown Alarm) Compressor dischage line temperature is above 130 C (266 F). COmpressor stopped until discharge line temperature decreases to 90 C (194 F); Indicates: Air in refrigeration system Low refrigerant charge Defective compressor or valve plate Defective liquid injection system Wrong or defective sensor

Operate unit on Cool and check discharge and suction pressure gauge readings. Enter Manual Function Test menu and test (operate) Injection Valve to determine if valve opens (energizes). Check compressor discharge sensor resistance. Resistance must be 100,000 ohms at 25 C (77 F). Check discharge line temperature with a separate electronic thermometer and compare to “HIGH PR TEMP” shown in the Data menu of controller. NOTE: Unit will operate normally without compressor sensor. However, controller compressor high temperature protection is not active.