Toshiba Air Conditioner Error Codes

Complete Diagnostic & Troubleshooting Guide

Communication Errors
E01
Indoor/Outdoor Communication Error
  • Power cycle the air conditioner.
  • Inspect wiring between indoor and outdoor units.
  • Check communication cable for damage or loose connections.
  • Replace PCB if communication failure persists.
E09
PCB Communication Failure
  • Check control board connections.
  • Inspect for moisture or corrosion on PCB.
  • Reset system and retest operation.
  • Replace main board if needed.
Sensor Errors
E02
Indoor Sensor Fault
  • Check room temperature sensor wiring.
  • Test thermistor resistance.
  • Inspect for loose or damaged connectors.
  • Replace indoor sensor if faulty.
E03
Outdoor Sensor Fault
  • Inspect outdoor temperature sensor.
  • Check wiring harness for damage.
  • Measure sensor resistance values.
  • Replace sensor if defective.
Compressor Protection Errors
E04
Compressor Overload Protection
  • Allow compressor to cool down.
  • Check refrigerant pressure levels.
  • Clean condenser coils for airflow.
  • Inspect compressor relay and capacitor.
Fan System Errors
E05
Fan Motor Error
  • Check fan blades for obstruction.
  • Inspect motor wiring connections.
  • Test fan motor operation.
  • Replace motor if faulty.
System Memory Errors
E06
EEPROM Failure
  • Power reset the unit.
  • Inspect control board for damage.
  • Check memory chip connections.
  • Replace PCB if issue persists.
Refrigerant System Errors
E07
Refrigerant Leak Detected
  • Inspect piping for leaks.
  • Check refrigerant pressure levels.
  • Look for oil stains around joints.
  • Recharge system after repair.
Electrical Protection Errors
E08
Overcurrent Protection
  • Check power supply voltage stability.
  • Inspect compressor current draw.
  • Look for short circuits in wiring.
  • Reset system after correction.
E10
System Protection Mode Active
  • Turn off unit and allow rest period.
  • Check for overheating or overload issues.
  • Ensure proper airflow around unit.
  • Restart after conditions normalize.
Important: Electrical and refrigerant repairs should only be performed by a qualified HVAC technician.