127 Alarm General Unit Error MP4000

Description 

Alarm General Unit Error 

• The surveillance has determined that the unit is not capable of continue running, and has shut down. 
• The reason is displayed at the controller main screen, and is stated at the event next to the alarm event. 
• Known reason to the shutdown state is: 
• “SET POINT OUT OF RANGE” 
• “VOLTAGE OUT OF RANGE” 
• “POWER LINE PHASE ERROR” 
• “REGULATION PROBE ERROR” 
• “COMPRESSOR TEMPERATURE HIGH” 

Corrective Action 

“SET POINT OUT OF RANGE” 

• The temperature set point is outside valid operation range. +30°C to -40°C (+35°C with extended range). 
• Check configurations and settings on the controller. 

“VOLTAGE OUT OF RANGE” 

• The measured voltage is below 330VAC. 
• Check power line voltage while loaded. 

“POWER LINE PHASE ERROR” 

• The phase detection system detects phase error or not capable of securing the correct rotation. 
• Check power line voltage and quality. 

“REGULATION PROBE ERROR” 

• If supply and return air temperature sensor and evaporator coil temperature sensors ALL indicate OPEN or SHORT circuit, the software is not capable of determine a reasonable action related to the cargo. 
• Follow steps related to the sensor alarms. 

“COMPRESSOR TEMPERATURE HIGH” 

• The compressor temperature is measured to be above 148°C. The state will stay until compressor temperature is measured to be below 132°C. 
• Check refrigerant level and flow through the cooling circuit.