Blue Star is one of India’s most trusted air conditioning brands, known for its reliable cooling and smart features. However, like all electronics, Blue Star split ACs can sometimes display error codes due to internal issues. Understanding these error codes can save time and help you diagnose problems before calling customer service.

In this blog, we’ll cover the most common Blue Star Split AC error codes, their meanings, and how you can fix them or when to seek professional help.

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🧊 What Are Blue Star AC Error Codes?

Error codes are combinations of letters and numbers that appear on the indoor unit’s display or remote screen when the AC detects a fault. These codes help identify which part of the system needs attention — from sensor failures to communication errors.

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📋 Blue Star Split AC Error Code List with Descriptions & Solutions

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

• Description: This means the sensor that reads the room’s temperature is faulty or disconnected.
• Solution:
  • Check if the sensor wire is loose or damaged.
  • If the sensor is broken, it needs replacement by a technician.

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2. Error Code: E2 – Evaporator Coil Sensor Error

• Description: Indicates a fault in the indoor unit’s coil sensor, which measures coil temperature.
• Solution:
  • Turn off the AC for 10 minutes and restart.
  • If the issue persists, contact support to replace the sensor.

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3. Error Code: E3 – Indoor Fan Motor Error

• Description: The indoor fan motor isn’t functioning properly.
• Solution:
  • Check for dust buildup or obstructions in the fan.
  • If the motor is faulty, professional servicing is required.

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4. Error Code: E4 – Indoor Unit Water Level Alarm

• Description: This error is usually seen in ducted split ACs, indicating water accumulation in the drain pan.
• Solution:
  • Clean the drain pipe.
  • Ensure proper slope for water flow.
  • If blocked, flush with pressure or call a technician.

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

• Description: The units are not syncing, often due to wiring or PCB issues.
• Solution:
  • Switch off the main power and restart after 10 minutes.
  • Check wiring connections.
  • Contact Blue Star support if the issue remains.

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6. Error Code: E6 – Outdoor Unit Coil Sensor Error

• Description: The outdoor coil temperature sensor is not reading properly.
• Solution:
  • Clean the coil and sensor area.
  • Replace the faulty sensor via service technician.

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7. Error Code: E7 – Outdoor Discharge Temperature Sensor Error

• Description: Error related to the discharge pipe sensor in the outdoor unit.
• Solution:
  • Restart the system.
  • If the code reappears, the sensor likely needs replacement.

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8. Error Code: E8 – Outdoor Unit Overload Protection

• Description: The compressor or fan motor has overloaded due to high temperature or voltage.
• Solution:
  • Turn off AC for at least 30 minutes.
  • Ensure there is no blockage around the outdoor unit.
  • Persistent errors need expert inspection.

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9. Error Code: E9 – EEPROM Parameter Error

• Description: The control board’s memory data is corrupted or unreadable.
• Solution:
  • The PCB may need reprogramming or replacement.
  • Call Blue Star’s service team for diagnosis.

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10. Error Code: F1 to F4 – Sensor & PCB-Related Errors

• F1: Indoor pipe temperature sensor error
• F2: Outdoor ambient temperature sensor fault
• F3: Outdoor discharge pipe sensor fault
• F4: Compressor drive board communication fault
• Solutions:
  • Check sensor wiring and clean sensor heads.
  • For PCB issues, technician support is essential.

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✅ General Tips to Handle Blue Star AC Errors

• Always restart the AC after any error — it sometimes resets minor issues.
• Keep the indoor and outdoor units clean and dust-free.
• Ensure voltage stabilizers are used if your area experiences fluctuations.
• Do not attempt to open or repair internal components unless you’re trained.

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📞 When to Call a Professional?

If restarting or basic troubleshooting doesn’t clear the error, or the same error returns frequently, contact Blue Star’s official service team. Handling electrical components without proper knowledge may lead to further damage or void your warranty.

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🔚 Final Thoughts

Understanding Blue Star Split AC error codes can help you identify problems early, saving you from discomfort and costly breakdowns. While some minor issues can be fixed by restarting or cleaning, sensor or PCB issues should be addressed by a technician.

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Need help with your Blue Star AC? Contact Blue Star customer support or your nearest authorized service center.

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