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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: E21
Remote controller thermistor error
Troubleshooting Steps:
Remote controller temperature sensor malfunction. Replace remote controller.
Error Code: E22
Discharge pipe temperature sensor
Troubleshooting Steps:
Discharge pipe sensor malfunction. Check sensor connections and operation.
Error Code: E23
Gas pipe temperature sensor
Troubleshooting Steps:
Gas pipe temperature sensor fault. Professional diagnosis required.
Error Code: E24
Liquid pipe temperature sensor
Error Code: E25
Heat sink temperature sensor
Error Code: E26
Heat exchanger outlet sensor
Error Code: E27
Water temperature sensor
Error Code: E28
Inverter temperature sensor
Troubleshooting Steps:
Inverter circuit temperature sensor error. Check inverter operation.
Error Code: E29
Outdoor pipe temperature sensor
Error Code: E30
Defrost sensor error
Error Code: E31
Filter sign detection error
Troubleshooting Steps:
Filter monitoring system fault. Check filter and monitoring sensor.
Error Code: E32
Louver motor error
Troubleshooting Steps:
Louver motor malfunction. Check motor operation and obstructions.
Error Code: E33
Indoor DC motor error
Troubleshooting Steps:
Indoor DC motor malfunction. Professional diagnosis required.
Error Code: E34
Outdoor DC motor error
Troubleshooting Steps:
Outdoor DC motor fault. Check motor operation and connections.
Error Code: E35
Option PCB error
Troubleshooting Steps:
Optional control board malfunction. Check connections and board operation.
Error Code: E36
Float switch error
Error Code: E37
Hot start protection
Troubleshooting Steps:
Hot start protection activated. System will restart after cooling down.
Error Code: E38
Oil return operation
Troubleshooting Steps:
Oil return operation in progress. Normal function for multi-unit systems.
Error Code: E39
Outdoor unit combination error
Troubleshooting Steps:
Outdoor unit combination mismatch. Check system configuration.
Error Code: E40
Indoor unit address error
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
Error Code: P11
Outdoor unit heat exchanger thermistor error
Troubleshooting Steps:
Outdoor heat exchanger thermistor fault. Professional replacement needed.
Error Code: P12
Compressor discharge thermistor error
Troubleshooting Steps:
Compressor discharge temperature sensor error. Check sensor connections.
Error Code: P13
High pressure switch malfunction
Troubleshooting Steps:
High pressure switch circuit error. Check switch and wiring.
Error Code: P14
Low pressure switch malfunction
Troubleshooting Steps:
Low pressure switch circuit error. Check switch operation.
Error Code: P15
Inverter overload protection
Troubleshooting Steps:
Inverter protection activated due to overload. Check system load.
Error Code: P16
Compressor overheating protection
Troubleshooting Steps:
Compressor overheating protection activated. Check system operation.
Error Code: P17
4-way valve defect
Troubleshooting Steps:
4-way valve malfunction. Professional diagnosis and replacement required.
Error Code: P18
Refrigerant shortage detection
Troubleshooting Steps:
System detected refrigerant shortage. Check for leaks and recharge.
Error Code: P19
Oil shortage protection
Troubleshooting Steps:
Compressor oil shortage detected. Professional service required.
Error Code: P20
Outdoor unit overload
Troubleshooting Steps:
Outdoor unit overload protection. Check electrical connections and load.
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