HVAC Toolkit

Panasonic Error Codes

Complete fault code reference for Panasonic mini-splits and air conditioners

Quick Reference: H = Hardware/protection | F = Protection faults | E = Electrical/communication

H-Series (Hardware/Protection Errors)

Code Description Possible Cause Solution
H00 No abnormality detected System normal or error cleared No action required
H11 Indoor/outdoor communication error Communication wire fault Check wiring between indoor and outdoor units
H12 Indoor unit capacity mismatch Total indoor capacity exceeds outdoor Verify capacity settings, check system design
H14 Indoor air thermistor fault Room temperature sensor failure Check and replace room thermistor
H15 Compressor thermistor fault Compressor sensor failure Check and replace compressor thermistor
H16 Outdoor current transformer fault CT sensor malfunction Check CT connections, replace outdoor PCB
H17 Indoor coil inlet thermistor fault Inlet thermistor failure Check and replace inlet thermistor
H18 Indoor coil outlet thermistor fault Outlet thermistor failure Check and replace outlet thermistor
H19 Indoor fan motor fault Fan motor locked or overcurrent Check fan motor, clean blower wheel
H21 Float switch activated Drain pan full or pump failure Clear drain line, check pump operation
H23 Indoor coil thermistor fault Evaporator sensor failure Check and replace coil thermistor
H24 Defrosting thermistor fault Defrost sensor failure Check and replace defrost thermistor
H25 Air purifying device fault Air purifier/ionizer error Check air purifying unit
H27 Outdoor air thermistor fault Outdoor ambient sensor failure Check and replace ambient thermistor
H28 Outdoor coil thermistor fault Condenser sensor failure Check and replace outdoor coil thermistor
H29 Discharge gas thermistor fault Discharge sensor failure Check and replace discharge thermistor
H30 Discharge gas temperature high Compressor overheating Check superheat, refrigerant charge
H32 Suction gas thermistor fault Suction sensor failure Check and replace suction thermistor
H33 Indoor/outdoor unit mismatch Incompatible units connected Verify correct unit pairing
H34 Gas side heat exchanger thermistor fault Heat exchanger sensor failure Check and replace thermistor
H35 Drain pump fault Drain pump motor failure Check and replace drain pump
H36 Gas leak detection Refrigerant leak sensor activated Find and repair refrigerant leak
H37 Indoor coil freeze protection Evaporator freezing detected Check airflow, filter, charge
H38 Indoor/outdoor unit mismatch Refrigerant type mismatch Verify correct refrigerant type
H39 Indoor/outdoor wiring error Incorrect wiring connections Verify wiring per diagram
H41 External protection device External safety device activated Check external protection circuit
H50 Indoor fan motor position fault Fan motor feedback error Check motor connections, replace motor
H51 Nozzle/louver error Vane motor fault Check louver motor operation
H97 Outdoor fan motor fault Outdoor fan motor locked Check outdoor fan motor
H98 Indoor high pressure protection High pressure at indoor unit Check refrigerant flow, EEV
H99 Indoor freeze protection Evaporator freeze detected Check airflow and charge

F-Series (Protection Faults)

Code Description Possible Cause Solution
F11 4-way valve fault Reversing valve not switching Check solenoid coil and valve operation
F17 Indoor freeze protection Anti-freeze activated during cooling Check airflow, filter, charge
F36 Outdoor ambient too high Ambient above operating limit Improve outdoor ventilation
F38 Outdoor ambient too low Ambient below operating limit Use low-ambient kit if needed
F90 PFC circuit protection Power factor correction fault Check power supply, replace outdoor PCB
F91 Refrigerant cycle fault Abnormal refrigerant flow Check charge, restrictions, valves
F93 Compressor rotor position fault Inverter position detection error Check compressor, inverter board
F94 Inverter overcurrent (software) High current detected Check compressor, charge, voltage
F95 Discharge pipe temperature protection Discharge temp too high Check superheat, charge
F96 IPM overheat protection Inverter module too hot Check ventilation, reduce load
F97 Compressor overcurrent Compressor drawing too much current Check compressor, charge
F98 Outdoor unit over-temperature PCB or heat sink too hot Check outdoor unit ventilation
F99 DC peak current Inverter overcurrent trip Check compressor, power supply

E-Series (Electrical/Communication Errors)

Code Description Possible Cause Solution
E01 Remote controller signal error No signal from remote Check remote batteries, receiver
E02 Wired remote communication error Wired controller fault Check wired remote connections
E03 Central control communication error Central controller fault Check central system wiring
E04 Indoor-outdoor communication error Communication line fault Check wiring between units
E06 Indoor unit address error Duplicate or invalid address Reset indoor unit address
E07 Indoor EEPROM error Indoor PCB memory fault Replace indoor PCB
E08 Remote controller fault Remote internal failure Replace remote controller
E09 Central control group error Group setting error Check group configuration
E13 Indoor PCB fault Main board failure Replace indoor PCB
E14 Outdoor PCB-PCB communication Internal outdoor comm error Check outdoor PCB connections
E16 Outdoor EEPROM error Outdoor PCB memory fault Replace outdoor PCB

LED Flash Codes (Timer Light)

Code Description Possible Cause Solution
1 Flash Room thermistor fault Room sensor failure Replace room thermistor
2 Flashes Indoor coil thermistor fault Evaporator sensor failure Replace coil thermistor
3 Flashes Communication error Indoor-outdoor comm fault Check communication wiring
4 Flashes Inverter fault Inverter board error Check outdoor PCB
5 Flashes Indoor fan motor fault Fan motor error Check fan motor
6 Flashes Float switch activated Drain pan full Clear drain line
7 Flashes Outdoor unit fault General outdoor error Check outdoor unit
8 Flashes EEPROM error Memory chip fault Replace PCB

Panasonic Error Code Troubleshooting

Common Errors

  • • H11: Communication error - check wiring first
  • • H19: Indoor fan motor - check for obstruction
  • • F91: Refrigerant cycle - verify charge
  • • H21: Float switch - clear drain line

Accessing Error Codes

  • • Codes display on indoor LED panel
  • • Timer light flashes indicate faults
  • • Hold CHECK button for 5 seconds
  • • Outdoor PCB has additional LEDs