51 Low Supply Voltage

Thermo King Alarm Code

Description

Corrective Action

Low Supply Voltage (Check Alarm) Alarm occurs if line voltage is below 350 volts for 30 minutes If the main power supply voltage to the unit, while running, drops below 340 VAC, the unit will stop running until the voltage increases above 350 VAC. If the main power supply voltage, on initial unit start up, is below 350 VAC, the unit will not start. If the voltage remains below 350 VAC for 30 minutes, Alarm 51 (Low Voltage) will occur.

Check line voltage of power source. Refer to the electrical specifications in the Specifications Section for correct power source requirements.