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Mitsubishi Electric Error Codes & Troubleshooting
Mitsubishi Electric Error Codes & Troubleshooting
Mitsubishi Electric offers premium air conditioning solutions with advanced inverter technology.
Error Code: E1
PCB fault (indoor unit)
Troubleshooting Steps:
Indoor unit control board malfunction. Professional replacement required.
Error Code: E2
PCB fault (outdoor unit)
Troubleshooting Steps:
Outdoor unit control board failure. Requires professional diagnosis.
Error Code: E3
High pressure switch
Troubleshooting Steps:
High pressure protection activated. Check system pressures and refrigerant charge.
Error Code: E4
Low pressure switch
Troubleshooting Steps:
Low pressure protection activated. Check for refrigerant leaks or undercharge.
Error Code: E5
Outdoor temperature sensor
Troubleshooting Steps:
Outdoor ambient temperature sensor fault. Check sensor and connections.
Error Code: E6
Indoor temperature sensor
Troubleshooting Steps:
Indoor temperature sensor malfunction. Affects temperature control accuracy.
Error Code: E7
Indoor fan motor
Troubleshooting Steps:
Indoor fan motor fault. Check for obstructions and motor operation.
Error Code: E8
Overcurrent
Troubleshooting Steps:
System overcurrent detected. Check electrical connections and components.
Error Code: E9
Electronic expansion valve fault
Troubleshooting Steps:
EEV malfunction detected. Professional diagnosis and replacement required.
Error Code: E10
Communication error between units
Troubleshooting Steps:
Communication fault between indoor and outdoor units. Check wiring.
Error Code: E11
Drain pump error
Troubleshooting Steps:
Drain pump malfunction. Check pump operation and drainage system.
Error Code: E12
Heat exchanger freeze protection
Troubleshooting Steps:
Indoor coil freeze protection activated. Check airflow and filters.
Error Code: E13
Compressor lock detection
Troubleshooting Steps:
Compressor mechanical lock detected. Immediate professional attention required.
Error Code: E14
Compressor overcurrent
Troubleshooting Steps:
Compressor drawing excessive current. Professional diagnosis required.
Error Code: E15
Fan motor overcurrent
Troubleshooting Steps:
Fan motor overcurrent protection. Check motor and electrical connections.
Error Code: E16
Current sensor fault
Troubleshooting Steps:
Current sensing circuit malfunction. Check electrical connections.
Error Code: E17
Outdoor heat exchanger sensor fault
Troubleshooting Steps:
Outdoor coil temperature sensor malfunction. Professional diagnosis needed.
Error Code: E18
Indoor heat exchanger sensor fault
Troubleshooting Steps:
Indoor coil temperature sensor error. Check sensor and connections.
Error Code: E19
Discharge temperature sensor fault
Error Code: E20
Suction temperature sensor fault
Error Code: P1
Power supply voltage
Troubleshooting Steps:
Power supply voltage abnormality. Check electrical supply and connections.
Error Code: P2
Power supply frequency fault
Error Code: P3
High temperature
Troubleshooting Steps:
System overheating detected. Check airflow and refrigerant levels.
Error Code: P4
Low pressure
Troubleshooting Steps:
Low pressure fault. Check for refrigerant leaks or undercharge.
Error Code: P5
Compressor motor current
Troubleshooting Steps:
Compressor overcurrent protection. Professional diagnosis required.
Error Code: P6
Communication error
Troubleshooting Steps:
Communication fault between units. Check connecting cables and connections.
Error Code: P7
Inverter fault
Troubleshooting Steps:
Inverter circuit malfunction. Professional repair required.
Error Code: P8
Heat sink temperature fault
Troubleshooting Steps:
Heat sink overheating. Check cooling system and ventilation.
Error Code: P9
Outdoor fan motor fault
Troubleshooting Steps:
Outdoor fan motor malfunction. Check motor operation and obstructions.
Error Code: P10
Defrost sensor fault
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