HVAC Toolkit
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Toshiba Error Codes

Inverter Mini-Splits & Air Conditioners ยท Japan

Prefixes: E=System/Sensor, F=Sensor/Protection, P=Protection, H=Status

E-Series (System/Sensor Errors)

Code Description Possible Cause Action
E01 Indoor PCB failure Indoor control board fault Replace indoor PCB
E02 Indoor/outdoor communication error Communication line disconnected Check signal wiring
E03 Remote controller communication error Remote signal fault Check remote and receiver
E04 Indoor fan motor error Fan motor locked or abnormal Check fan motor and wiring
E05 Indoor thermistor fault Room temperature sensor failure Check room sensor resistance
E06 Indoor coil sensor fault Evaporator thermistor failure Check coil temperature sensor
E07 Drain sensor/pump fault Drainage system error Check drain line and float switch
E09 Indoor EEPROM error EEPROM data corrupted Reset power; replace PCB if needed
E10 Multi-indoor capacity error Indoor capacity exceeds outdoor Verify unit capacity matching
E15 Outdoor PCB fault Outdoor control board failure Replace outdoor PCB
E16 Compressor overcurrent Compressor drawing excess current Check compressor, charge, voltage
E17 Outdoor fan motor fault Fan motor error Check outdoor fan motor and wiring
E18 Outdoor coil sensor fault Condenser thermistor failure Check outdoor coil sensor
E19 Outdoor ambient sensor fault Outdoor temperature sensor failure Check outdoor ambient sensor
E20 Discharge temperature sensor fault Discharge thermistor failure Check discharge temperature sensor
E21 High pressure protection System high pressure exceeded Check condenser, fan, charge
E22 Compressor overheating Compressor discharge temperature high Check superheat, charge, airflow
E23 Low pressure protection System low pressure detected Check for leaks, verify charge
E24 Inverter overcurrent IPM module overcurrent Check inverter module and compressor
E27 Outdoor EEPROM error Outdoor EEPROM corrupted Reset power; replace outdoor PCB
E28 DC voltage abnormal Inverter DC bus fault Check power supply, rectifier
E31 Heat sink temperature high Inverter overheating Check outdoor unit ventilation

Toshiba Troubleshooting Tips

Before Calling for Service

  • Turn off unit, wait 5 minutes, then restart - some errors auto-reset
  • Check and clean air filters - many errors caused by restricted airflow
  • Verify power supply voltage is within specification
  • Check circuit breaker and disconnect switch
  • Note the exact error code and when it occurs for technician

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