Mitsubishi Electric is a leading name in HVAC systems, known for its premium-quality split air conditioners. These units come equipped with advanced diagnostic systems that display error codes when something goes wrong, helping technicians and users identify and fix issues quickly.

This blog provides a detailed Mitsubishi Split AC error code list, along with explanations and easy-to-follow solutions.

❓ What Are Mitsubishi AC Error Codes?

Mitsubishi split ACs use alphanumeric error codes displayed on the remote controller or indoor unit panel to indicate malfunctions. These errors range from minor sensor faults to serious system issues like compressor or PCB failures.

📋 Mitsubishi Split AC Error Code List with Description & Solutions

1. Error Code: E0 – Indoor Unit EEPROM Error

• Description: Fault in the memory chip (EEPROM) of the indoor unit.
• Solution:
  • Restart the unit.
  • If error persists, the indoor PCB may need to be reset or replaced.

2. Error Code: E1 – Communication Error Between Indoor & Outdoor Units

• Description: Data transmission between indoor and outdoor units is interrupted.
• Solution:
  • Turn off power for 5 minutes and restart the unit.
  • Inspect communication wiring for damage or loose connections.
  • Replace PCB if required.

3. Error Code: E6 – Indoor Fan Motor Failure

• Description: Indoor fan motor is not spinning or facing load issues.
• Solution:
  • Clean fan blades and check for obstruction.
  • Check motor wiring and capacitor.
  • Replace fan motor if defective.

4. Error Code: E7 – Outdoor Fan Motor Failure

• Description: Fan motor in the outdoor unit is not operating properly.
• Solution:
  • Inspect outdoor fan for blockages.
  • Check motor voltage and capacitor.
  • Replace the motor if required.

5. Error Code: P1 – Low Voltage or Power Supply Error

• Description: AC is receiving unstable or low voltage.
• Solution:
  • Use a voltage stabilizer.
  • Check for loose power connections.
  • Contact an electrician if voltage fluctuates often.

6. Error Code: P4 – Discharge Pipe Temperature Sensor Error

• Description: The discharge sensor in the outdoor unit has malfunctioned.
• Solution:
  • Check sensor placement and wiring.
  • Replace the sensor if it’s damaged.

7. Error Code: P5 – Overheating or Overcurrent at Compressor

• Description: The compressor is overheating or drawing excess current.
• Solution:
  • Turn off AC and let it cool.
  • Ensure proper airflow to the outdoor unit.
  • If the issue continues, contact a technician for a compressor inspection.

8. Error Code: P6 – Indoor Coil Temperature Sensor Error

• Description: Fault in the indoor coil sensor.
• Solution:
  • Inspect sensor wiring and connection.
  • Replace if defective.

9. Error Code: P8 – Indoor Unit Drain Level Error

• Description: Fault in water drainage, possibly a blocked drain pump or pipe.
• Solution:
  • Clean the drain pipe and check for clogs.
  • Ensure the indoor unit is level.
  • Replace or service the drain pump if needed.

10. Error Code: U4 – Indoor-Outdoor Transmission Error

• Description: The communication between multiple indoor units and the outdoor unit is failing in multi-split systems.
• Solution:
  • Check inter-unit communication wires.
  • Reset the system.
  • Replace control boards if faulty.

✅ Maintenance Tips to Prevent Error Codes

• Clean air filters every 15 days.
• Keep outdoor unit free from dust and obstruction.
• Use a voltage stabilizer for steady power supply.
• Do not ignore error codes—address them immediately.
• Schedule a professional service check every 6–12 months.

📞 When to Call a Professional

You should consult a certified Mitsubishi technician if:

• The same error code keeps reappearing after a reset.
• The unit makes unusual sounds or fails to start.
• You notice reduced cooling or water leakage.
• Multiple units are affected in a multi-split setup.

🔚 Conclusion

Understanding the Mitsubishi Split AC error code list can save you time and help you identify whether a reset will work or if you need professional assistance. While some issues can be resolved with basic checks, others—especially involving PCBs or compressors—require expert intervention.

Need expert AC servicing? Contact Mitsubishi Electric customer care or your local authorized technician for prompt support.

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