Error Code	Symptom	Fault Type	Guide
E0	Indoor unit will not start, display shows E0 shortly after power-on	Indoor Unit EEPROM Initialization Error	View Details
E1	Indoor unit stops and displays E1, outdoor unit does not start	Indoor–Outdoor Communication Failure	View Details
E2	Indoor unit stops, E2 displayed, fan may run briefly then stop	Indoor Room Temperature Sensor (Thermistor) Fault	View Details
E3	Indoor unit stops cooling/heating, E3 displayed, may stop shortly after startup	Indoor Coil (Heat Exchanger) Temperature Sensor Fault	View Details
E4	Indoor unit shows E4, unit may not respond to remote commands	Indoor Unit EEPROM or Configuration Error	View Details
E5	Indoor unit displays E5, operation stops shortly after starting	Indoor Fan Motor Lock or Feedback Error	View Details
E6	Indoor unit shows E6, outdoor unit does not start, no cooling or heating	Outdoor Unit Communication or Power Supply Error	View Details
E7	Indoor unit displays E7, louver may not move correctly	Indoor Horizontal/Vertical Louver Motor Fault	View Details
E8	Indoor unit shows E8, unit may stop during operation, sometimes related to overcurrent	Indoor Fan Overcurrent or PCB Overload Protection	View Details
E9	Indoor unit displays E9, unit may stop and drain pan may be full of water	Drain Pump or Float Switch Error	View Details
F1	Indoor unit displays F1, unit may not respond to remote	Indoor Unit Communication Address or Remote Receiver Error	View Details
F2	Indoor unit displays F2, operation stops	Indoor Humidity Sensor or Additional Thermistor Fault (model-dependent)	View Details
F3	Indoor unit displays F3, often related to intake or discharge air temperature	Indoor Intake or Discharge Air Thermistor Fault	View Details
F4	Indoor unit displays F4, unit may stop during operation	Indoor Heat Exchanger Freeze / Overheat Protection	View Details
F5	Indoor unit displays F5, often associated with outdoor ambient temperature sensor	Outdoor Ambient Temperature Sensor Fault	View Details
F6	Indoor unit displays F6, system may not start or may stop unexpectedly	Indoor–Remote Controller Communication Error (wired controller models)	View Details
F7	Indoor unit displays F7, often in multi-split systems	Indoor Unit Address Conflict or Capacity Mismatch	View Details
F8	Indoor unit displays F8, system may not operate in certain modes	Mode Conflict or Central Control Lockout	View Details
F9	Indoor unit displays F9, often related to filter or air quality functions	Filter Sign / Air Quality Sensor Error	View Details
P1	Outdoor unit stops, P1 error logged or displayed, compressor does not run	Inverter DC Bus Overvoltage / Undervoltage	View Details
P2	Outdoor unit stops, P2 error, compressor may start then quickly stop	Inverter Module Overcurrent / Short Circuit Protection	View Details
P3	Outdoor unit stops with P3, often during high load or high ambient temperature	Outdoor Heat Sink / Inverter Overheating	View Details
P4	System stops with P4, often associated with compressor temperature issues	Compressor Discharge Temperature High	View Details
P5	System stops with P5, often during heating mode	Outdoor Coil Temperature Sensor / Defrost Control Error	View Details
P6	System stops with P6, compressor may not start or may stop quickly	Compressor Position / Inverter Drive Error	View Details
P7	System stops with P7, often related to low ambient or abnormal pressure	Low Pressure / Suction Temperature Protection	View Details
P8	System stops with P8, may occur during defrost or mode change	Four-Way Reversing Valve or Discharge Pressure Protection	View Details
–	Burning or electrical smell from indoor or outdoor unit	Overheating Electrical Component	View Details
–	Indoor unit displays lights but does not respond to remote control commands	Remote Control Reception Failure	View Details
–	Indoor unit does not start at all; no lights or response to remote	No Power to Indoor Unit	View Details
–	Indoor unit emits clicking or ticking noises when starting or stopping	Thermal Expansion and Plastic Casing Noise	View Details
–	Indoor unit fan does not run, but lights and display are on; compressor may or may not run	Indoor Fan Motor Failure	View Details
–	Indoor unit frequently turns on and off (short cycling) without reaching set temperature	Short Cycling / Control Instability	View Details
–	Indoor unit makes loud rattling, buzzing, or grinding noises during operation	Indoor Mechanical Noise / Fan Imbalance	View Details
–	Indoor unit powers on but compressor and outdoor fan do not start; only indoor fan runs	Outdoor Unit Not Operating	View Details
–	Indoor unit runs but does not cool effectively; air is only slightly cool or room never reaches set temperature	Insufficient Cooling Capacity / Performance Degradation	View Details
–	Outdoor fan does not run while compressor is operating, causing very hot air and possible shutdown	Outdoor Fan Motor Failure	View Details
–	Outdoor unit makes loud humming, rattling, or metallic noises	Outdoor Mechanical Noise / Vibration	View Details
–	Strong musty or moldy smell from indoor unit when it starts	Biological Growth on Indoor Coil and Drain Pan	View Details
–	Unit runs in heating mode but delivers only lukewarm air and room does not heat adequately	Poor Heating Performance	View Details
–	Unit trips the circuit breaker when starting or during operation	Electrical Overload or Short Circuit	View Details
–	Water dripping from outdoor unit or excessive water around base	Outdoor Unit Condensate / Defrost Water Drainage Issue	View Details
–	Water dripping from the indoor unit front panel or onto the wall/floor	Indoor Unit Water Leakage	View Details

Mitsubishi Electric Air Conditioners Error Codes

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