Carrier is a leading name in air conditioning systems, offering reliable and energy-efficient split AC units. But like any smart appliance, a Carrier split AC can show error codes when it encounters internal issues. These codes are useful for diagnosing faults quickly and accurately.

In this blog, we’ve compiled a list of the most common Carrier split AC error codes, their meanings, and how to fix them. Whether you’re a technician or a user, this guide will help you troubleshoot faster and more effectively.

❓ What Are Carrier Split AC Error Codes?

Carrier split ACs are equipped with self-diagnostic systems. When something goes wrong, the indoor unit displays a specific error code that refers to a particular fault – such as a sensor malfunction, communication error, or abnormal operation.

📋 Carrier Split AC Error Code List with Descriptions & Solutions

1. Error Code: E1 – Indoor Room Temperature Sensor Error

• Description: The AC can’t read the room temperature due to a faulty or disconnected sensor.
• Solution:
  • Check for loose or damaged sensor wiring.
  • Replace the sensor if faulty.
  • Restart the unit after reconnecting.

2. Error Code: E2 – Evaporator Coil Sensor Error

• Description: This indicates a malfunction in the indoor coil sensor.
• Solution:
  • Ensure the sensor is placed correctly on the coil.
  • Replace the sensor if the reading is inaccurate or missing.

3. Error Code: E3 – Indoor Fan Motor Error

• Description: The indoor fan is not rotating properly.
• Solution:
  • Clean the fan blades and motor housing.
  • Check for motor burnout or wiring issues.
  • Replace the motor if it fails to operate.

4. Error Code: E4 – Outdoor Unit Discharge Sensor Error

• Description: The outdoor discharge pipe sensor is not functioning.
• Solution:
  • Inspect the sensor for dirt or damage.
  • Replace the discharge temperature sensor if needed.

5. Error Code: E5 – Communication Error (Indoor & Outdoor Units)

• Description: Indicates communication failure between indoor and outdoor units.
• Solution:
  • Turn off power and restart after 5–10 minutes.
  • Check for broken or loose wiring between units.
  • If the PCB is faulty, replacement may be required.

6. Error Code: E6 – Overload or Compressor Protection

• Description: The compressor is overloaded or protection mode is activated.
• Solution:
  • Ensure there’s no airflow blockage around the outdoor unit.
  • Let the unit cool down and restart.
  • If repeated, contact support to check the compressor and capacitor.

7. Error Code: E7 – Outdoor Fan Motor Error

• Description: The fan motor in the outdoor unit is not functioning.
• Solution:
  • Inspect the motor for dust, damage, or capacitor failure.
  • Replace if the motor does not respond.

8. Error Code: E8 – Overcurrent or Overvoltage Protection

• Description: Indicates a high current or voltage supply issue.
• Solution:
  • Switch off the unit immediately.
  • Use a voltage stabilizer if needed.
  • Get professional inspection for PCB or compressor damage.

9. Error Code: F1 – EEPROM/Memory Error

• Description: There is a data error in the control board’s memory.
• Solution:
  • Reset the system.
  • If the issue remains, the main PCB may need reprogramming or replacement.

10. Error Code: F2 – Indoor Pipe Temperature Sensor Error

• Description: The sensor reading the pipe temperature inside the indoor unit is faulty.
• Solution:
  • Inspect the sensor and wire connections.
  • Replace the sensor if defective.

✅ Pro Tips to Prevent Carrier AC Errors

• Regularly clean filters, coils, and outdoor unit vents.
• Install a voltage stabilizer in areas with unstable power supply.
• Schedule professional servicing every 6–12 months.
• Always check the remote and display panel for blinking codes and patterns.

📞 When to Call a Professional

If the issue:

• Persists after a reset,
• Involves electrical components, or
• Repeats frequently,

…it’s best to consult Carrier’s authorized service team for proper diagnosis and repair.

🔚 Conclusion

Understanding Carrier split AC error codes can help you troubleshoot problems quickly and save time. While some issues can be resolved with basic checks, others need expert intervention. Bookmark this guide or share it with someone who owns a Carrier AC—it might just save them from a sweaty situation!

Need help with Carrier AC servicing? Contact your local service center or visit the official Carrier support website.