This guide explains all Toshiba Air Conditioner error codes (CH series) with simple troubleshooting steps to help you identify and fix common issues safely before calling a technician.
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 main control board connections.
- Inspect for moisture or corrosion on PCB.
- Reset system power and retest operation.
- Replace main board if needed.
E11
Signal Transmission Fault
- Check signal wiring harness.
- Inspect connectors for looseness or damage.
- Test communication continuity.
- Replace control PCB if signal fails.
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.
E12
Pipe Temperature Sensor Error
- Check pipe thermistor connection.
- Inspect insulation around sensor.
- Test resistance values.
- Replace sensor if readings are abnormal.
E04
Compressor Overload Protection
- Allow compressor to cool down.
- Check refrigerant pressure levels.
- Clean condenser coils for airflow.
- Inspect relay and capacitor.
E13
Compressor Start Failure
- Check power supply stability.
- Inspect start capacitor and relay.
- Verify compressor wiring connections.
- Replace compressor components if needed.
E05
Fan Motor Error
- Check fan blades for obstruction.
- Inspect motor wiring connections.
- Test fan motor operation.
- Replace motor if faulty.
E14
Indoor Fan Lock Error
- Check for dust or blockage in fan housing.
- Inspect motor shaft movement.
- Test fan motor capacitor.
- Replace fan motor if stuck.
E06
EEPROM Failure
- Power reset the unit.
- Inspect control board for damage.
- Check memory chip connections.
- Replace PCB if issue persists.
E15
Main Control Memory Error
- Perform full system reset.
- Check for voltage fluctuations.
- Inspect PCB for corrosion or burn marks.
- Replace main board if necessary.
E07
Refrigerant Leak Detected
- Inspect piping for leaks.
- Check refrigerant pressure levels.
- Look for oil stains around joints.
- Recharge system after repair.
E16
Low Refrigerant Pressure
- Check for gas leakage in system.
- Inspect service valves and joints.
- Measure system pressure levels.
- Recharge refrigerant if needed.
E08
Overcurrent Protection
- Check power supply voltage stability.
- Inspect compressor current draw.
- Look for short circuits in wiring.
- Reset system after correction.
E17
Voltage Fluctuation Error
- Check incoming power supply.
- Use voltage stabilizer if needed.
- Inspect power cord condition.
- Restart after voltage stabilizes.
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.
E5
Temperature Detection Fault
- Allow unit to reach proper operating temperature.
- Check environment stability.
- Inspect sensor placement and wiring.
- Restart after 10–15 minutes.
E18
Defrost System Abnormality
- Check defrost heater operation.
- Inspect defrost sensor and timer.
- Look for ice buildup on evaporator coil.
- Replace defrost components if needed.
E19
High Temperature Protection
- Check airflow blockage.
- Inspect condenser cleanliness.
- Verify compressor operation.
- Allow system to cool and restart.
Frequently Asked Questions
Why does my Toshiba Air Conditioner show system error or ERR messages?
ERR messages on Toshiba Air Conditioners usually indicate sensor faults, communication errors between indoor and outdoor units, compressor protection activation, fan motor issues, refrigerant pressure abnormalities, or control board malfunctions. Turn off the unit, wait a few minutes, then restart. Check power supply, wiring connections, filters, and airflow conditions.
Why does my Toshiba Air Conditioner stop cooling properly?
This is often caused by dirty air filters, blocked condenser coils, refrigerant leaks, faulty sensors, or weak compressor performance. Clean filters and coils, ensure proper airflow, and verify temperature settings.
Why does my Toshiba Air Conditioner not turn on?
Check power outlet, circuit breaker, remote batteries, and internal fuse. Ensure stable voltage supply. Perform a reset by turning off power for 5–10 minutes before restarting.
Why is my Toshiba Air Conditioner making unusual noises?
Unusual noises may come from fan motor imbalance, loose internal components, refrigerant flow sounds, or debris inside the unit. Inspect fan blades, clean filters, and ensure the unit is properly mounted.
Why is my Toshiba Air Conditioner leaking water?
Water leaks are usually caused by clogged drain pipes, dirty filters, improper installation, or ice buildup on the evaporator coil. Clean drain lines and ensure proper unit leveling.
Why is my Toshiba Air Conditioner not maintaining temperature?
This may be caused by faulty thermistor sensors, refrigerant issues, dirty coils, or incorrect thermostat settings. Clean the system and verify temperature calibration.
Why does my Toshiba Air Conditioner ice up?
Ice buildup is usually caused by low refrigerant, dirty filters, poor airflow, or faulty evaporator fan operation. Clean filters and check airflow to prevent freezing.
Why does my Toshiba Air Conditioner run continuously?
Continuous operation may be caused by dirty coils, incorrect temperature settings, refrigerant issues, or a malfunctioning thermostat sensor. Clean coils and adjust settings properly.
Why does my Toshiba Air Conditioner not respond to remote control?
This can be caused by weak remote batteries, blocked IR sensor, or receiver board failure. Replace batteries, clean sensor area, and restart the unit.
How do I reset my Toshiba Air Conditioner system errors?
Turn off the unit and disconnect power for 5–10 minutes. Restore power to allow system recalibration and clearing of temporary error codes.
When should I service my Toshiba Air Conditioner?
Service is recommended if cooling performance drops repeatedly, error messages persist, compressor fails to start, or unusual noises continue after troubleshooting.
Important: Toshiba Air Conditioner system messages are safety and diagnostic features designed to protect key components such as the compressor, fan motors, sensors, refrigerant system, and control board. If issues continue after troubleshooting, contact an authorized Toshiba service technician.