Blue Star is one of India’s most trusted air conditioning brands, known for powerful cooling and energy-efficient performance. Like most modern ACs, Blue Star window air conditioners come equipped with a self-diagnosis system that displays error codes when something goes wrong.

Understanding these error codes can help you troubleshoot problems quickly — some can be solved at home, while others may need professional assistance.

In this blog, we’ll cover the most common Blue Star Window AC error codes, their meanings, and easy-to-follow solutions.

🧾 Blue Star Window AC Error Code List (With Descriptions & Solutions)

E1 – Indoor Room Temperature Sensor Fault

• Description: The sensor responsible for detecting the room temperature has failed or become disconnected.
• Solution:
  • Check for loose connections or damaged wires on the temperature sensor.
  • Restart the AC and observe if the error clears.
  • Replace the sensor if needed.

E2 – Indoor Coil Sensor Error

• Description: The sensor that monitors the indoor coil temperature is malfunctioning.
• Solution:
  • Inspect the coil sensor for damage or dirt.
  • Reconnect loose wires or replace the sensor.

E3 – Fan Motor Malfunction

• Description: The fan motor is not rotating or is running at incorrect speed.
• Solution:
  • Clean the fan blades and motor vents.
  • Check capacitor and motor wiring.
  • Replace the motor if faulty.

E4 – Water Drainage Error (if equipped with auto-drain)

• Description: The AC is unable to drain the condensed water, causing overflow.
• Solution:
  • Clean the drain pipe or tray to remove blockages.
  • Ensure the unit is tilted slightly backward.
  • If auto-drain pump is installed, check its functionality.

E5 – Communication Error

• Description: Internal communication between AC components has failed.
• Solution:
  • Restart the unit after turning off the main power.
  • Check for wiring or PCB issues.
  • If the error continues, contact a technician to inspect the control board.

E6 – Voltage/Power Supply Fluctuation

• Description: The unit has detected an abnormal voltage level or surge.
• Solution:
  • Use a proper voltage stabilizer if you live in an area with frequent voltage fluctuations.
  • Avoid running the AC on generator/inverter backup without checking load compatibility.

E7 – Outdoor Temperature Sensor Fault (if model includes external sensing)

• Description: The outdoor ambient sensor is not functioning or reading incorrectly.
• Solution:
  • Inspect sensor wiring and mount.
  • Replace if faulty or shorted.

F1 – PCB/EEPROM Error

• Description: A malfunction in the memory chip or control board is detected.
• Solution:
  • Restart the unit.
  • If the error recurs, the indoor PCB might need replacement by a service technician.

🧼 Tips to Avoid Common AC Errors

• 🧽 Clean air filters every 15 days.
• 🔌 Install a voltage stabilizer to avoid E6-type errors.
• 💧 Check drain outlets periodically for blockages.
• 🌬️ Avoid obstructing vents to ensure airflow.
• 🛠️ Get regular servicing done by Blue Star authorized professionals.

📞 When to Call for Help

You should call a Blue Star service technician if:

• Errors keep reappearing after restarts.
• The AC isn’t cooling or is making unusual noises.
• There’s water leakage or complete power failure.
• You’re unsure how to handle wiring or sensor parts safely.

✅ Conclusion

Knowing what each Blue Star Window AC error code means can save you time, money, and discomfort. Minor issues like dirty filters or sensor misplacements can be resolved on your own, but for electrical faults or PCB-related errors, it’s best to call a professional.

Need Support?
📞 Call Blue Star Customer Care or visit their official service portal for reliable assistance.

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