O General is a reputed brand in the air conditioning market, known for its high-performance, long-lasting, and efficient cooling systems. While their window ACs are built for durability, like any smart device, they come equipped with self-diagnosis systems that display error codes when something goes wrong.

In this blog, we’ll provide a complete O General Window AC error code list, including descriptions of each error and step-by-step solutions to help you troubleshoot your AC effectively.

📋 O General Window AC Error Codes with Descriptions & Solutions

Note: Error codes may vary slightly by model. Refer to your AC’s manual or use this as a general reference.

E0 – EEPROM Communication Error

• Description: The memory chip (EEPROM) on the main PCB is faulty or not responding.
• Solution:
  • Restart the AC.
  • If the error returns, contact a technician to reprogram or replace the PCB.

E1 – Indoor Temperature Sensor Error

• Description: The sensor that detects room temperature is malfunctioning.
• Solution:
  • Check the sensor wiring.
  • Replace the sensor if it’s loose, shorted, or damaged.

E2 – Indoor Coil Temperature Sensor Error

• Description: The evaporator coil temperature sensor is not working.
• Solution:
  • Inspect sensor placement and wires.
  • Clean any dust buildup near the sensor.
  • Replace the sensor if necessary.

E3 – Indoor Fan Motor Malfunction

• Description: The fan motor is either not rotating or spinning abnormally.
• Solution:
  • Turn off the unit and inspect the fan area.
  • Clean the fan and check for any obstructions.
  • Replace the motor or capacitor if faulty.

E4 – Overload Protection / Compressor Overheat

• Description: The compressor is either overheating or under excess pressure.
• Solution:
  • Turn off the unit for 30 minutes and restart.
  • Ensure proper ventilation around the outdoor-facing side.
  • If the problem persists, a technician should inspect the compressor.

E5 – Communication Error Between Internal Components

• Description: Data exchange between the display board and main PCB is interrupted.
• Solution:
  • Power off the unit completely, wait a few minutes, and restart.
  • Check internal wiring and connectors.
  • Replace the control board if needed.

E6 – Voltage Fluctuation / Power Supply Error

• Description: The AC is experiencing abnormal input voltage.
• Solution:
  • Use a voltage stabilizer to maintain consistent input.
  • Restart the unit once the voltage stabilizes.
  • Contact an electrician if fluctuation is frequent.

E7 – Outdoor Temperature Sensor Error (for inverter-based window units)

• Description: The sensor monitoring external temperature is malfunctioning.
• Solution:
  • Inspect the sensor for damage or loose wires.
  • Replace the sensor if readings are incorrect.

E8 – Drainage Problem or Overflow Detection

• Description: Water is not draining properly, or the unit has detected overflow.
• Solution:
  • Clear the drainage hole and tray.
  • Ensure the unit is slightly tilted backward for proper water flow.
  • Call a technician if the internal pump is faulty (for inverter models).

🧼 Tips to Prevent O General AC Errors

• ✅ Clean filters every 2–3 weeks.
• ⚡ Use a voltage stabilizer to protect your AC from surges.
• 🌬️ Keep the back side (outdoor-facing) of the unit free from blockages.
• 🧰 Get your AC professionally serviced once a year.
• 👂 Investigate unusual noises, leaks, or blinking displays right away.

📞 When to Call a Technician

You should contact a certified O General service technician if:

• The error code reappears after restarting.
• Your AC is not cooling effectively.
• You hear grinding, buzzing, or clicking noises.
• You notice electrical burning smells or water leakage.

✅ Final Thoughts

Understanding the O General Window AC error code list helps you take quick action when your unit shows signs of trouble. While you can handle simple tasks like cleaning filters or resetting the unit, serious issues such as sensor faults or PCB errors should be addressed by professionals.

Need expert assistance? Contact O General’s customer service or your nearest authorized service center for reliable support.