Error Code	Symptom	Fault Type	Guide
E0	Indoor unit will not operate, display shows E0 shortly after power-on	Indoor Unit EEPROM Communication Error	View Details
E1	Outdoor unit does not start, indoor unit shows E1 or flashes timer LED in E1 pattern	Indoor-Outdoor Communication Failure	View Details
E2	Indoor unit stops shortly after starting, E2 displayed or timer LED flashes E2 pattern	Indoor Room Temperature Sensor (Thermistor) Fault	View Details
E3	Unit stops cooling or heating, E3 error indicated, fan may continue running	Indoor Heat Exchanger (Coil) Temperature Sensor Fault	View Details
E4	Outdoor unit does not start compressor, E4 error displayed on indoor unit	Outdoor Unit EEPROM or Control Fault	View Details
E5	Indoor unit stops, E5 error, often during heating mode changeover	Outdoor Discharge Pipe Temperature Sensor Fault	View Details
E6	Unit stops with E6 error, often during heating defrost or low ambient operation	Outdoor Heat Exchanger (Coil) Temperature Sensor Fault	View Details
E7	Indoor unit shows E7, outdoor fan may not run or runs erratically	Outdoor Fan Motor or Fan Feedback Error	View Details
E8	Indoor unit stops, E8 displayed, often associated with abnormal compressor operation	Compressor Overload or Inverter Module Protection	View Details
E9	Indoor unit shows E9, unit may stop shortly after starting	Indoor Fan Motor or Fan Feedback Error	View Details
F0	Indoor unit displays F0, unit may not start or may shut down quickly	Refrigerant System Low Pressure / Undercharge Protection	View Details
F1	Indoor unit shows F1, unit may stop during heavy load conditions	High Pressure Protection / Overcharge or Airflow Fault	View Details
F2	Indoor unit displays F2, unit may stop in heating mode	Defrost Sensor or Defrost Control Error	View Details
F3	Indoor unit shows F3, unit may shut down during extreme temperatures	Discharge Temperature High Protection	View Details
F4	Indoor unit displays F4, unit may not heat properly	Outdoor Ambient Temperature Sensor Fault	View Details
F5	Indoor unit shows F5, unit may not respond correctly to remote control temperature settings	Indoor Intake Air Temperature Sensor Fault	View Details
F6	Indoor unit displays F6, unit may not control coil temperature correctly	Indoor Heat Exchanger Outlet Temperature Sensor Fault	View Details
F7	Indoor unit shows F7, abnormal compressor speed control, unit may not reach set temperature	Inverter Compressor Speed Control Error	View Details
F8	Indoor unit shows F8, unit may stop during heating or cooling under heavy load	Current Sensor / Overcurrent Detection Error	View Details
F9	Indoor unit displays F9, unit may not operate in certain modes	Four-Way Valve (Reversing Valve) Control Error	View Details
H0	Indoor unit shows H0, unit may not respond to remote control	Indoor Unit Remote Receiver or PCB Error	View Details
H1	Indoor unit shows H1, unit may not start compressor	Indoor-Outdoor Addressing or Capacity Mismatch Error	View Details
H2	Indoor unit shows H2, unit may run at reduced capacity	Indoor Fan Speed Feedback Error (Abnormal RPM)	View Details
H3	Indoor unit shows H3, compressor does not start	Compressor Lock or Start Failure Protection	View Details
H4	Indoor unit shows H4, unit may stop unexpectedly	Indoor PCB Overheat or Power Supply Error	View Details
H5	Indoor unit shows H5, unit may not operate in certain modes or capacities	Outdoor Unit Capacity Control or Expansion Valve Error	View Details
H6	Indoor unit shows H6, outdoor fan may not operate correctly	Outdoor Fan Speed Feedback Error	View Details
H7	Indoor unit shows H7, unit may not operate multiple indoor units correctly (multi-split)	Indoor Unit Capacity or Port Assignment Error (Multi-Split)	View Details
H8	Indoor unit shows H8, unit may run but with abnormal performance	Indoor Coil Frost Protection or Low Airflow Error	View Details
H9	Indoor unit shows H9, unit may not respond to wired controller correctly	Wired Remote Controller Communication Error	View Details
–	Burning or electrical smell from indoor or outdoor unit	Overheating Electrical Component or Wiring Fault	View Details
–	Indoor fan runs but compressor and outdoor fan do not start; only room air is circulated	Outdoor Unit Not Running	View Details
–	Indoor unit displays lights but does not respond to any commands (frozen controls)	Control Lockup / Microcontroller Hang	View Details
–	Indoor unit emits a musty or moldy odor when starting	Biological Growth on Indoor Coil or Drain Pan	View Details
–	Indoor unit louvers do not move or are stuck in one position	Louver Motor or Linkage Failure	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
–	Indoor unit runs but does not heat effectively in heating mode; air is lukewarm and room stays cold	Insufficient Heating Capacity / Defrost or Refrigerant Issue	View Details
–	Loud buzzing, humming, or rattling noise from the outdoor unit	Outdoor Mechanical or Electrical Noise	View Details
–	Loud rattling or vibrating noise from the indoor unit during operation	Indoor Mechanical Vibration / Loose Components	View Details
–	Remote control does not operate the indoor unit, but unit works from manual button (if present)	Remote Control Signal Reception Failure	View Details
–	Unit blows cold air in heating mode or hot air in cooling mode intermittently	Reversing Valve or Mode Control Malfunction	View Details
–	Unit frequently starts and stops (short cycling) without reaching set temperature	Short Cycling / Control or Capacity Issue	View Details
–	Unit will not start at all; no lights or response from indoor unit	No Power to Indoor Unit	View Details
–	Water dripping from the outdoor unit or piping during cooling operation	Normal Condensation or Insulation Failure	View Details
–	Water leaking from the indoor unit onto the wall or floor during cooling	Indoor Condensate Drainage Failure	View Details

Fujitsu Air Conditioners Error Codes

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