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haier | air-conditioner Error Codes: Troubleshooting, Fixes & Prevention Tips explained below.

What Does CH02 Error Mean?❓

The CH02 error indicates that the coil inlet temperature sensor is either malfunctioning or sending incorrect readings. This sensor helps monitor the refrigerant temperature entering the indoor coil. If it fails, the AC may shut down or operate inefficiently to prevent damage. Addressing this error ensures proper system cooling and prevents overuse of the compressor.

air-conditioner - What Causes the CH02 Error?

  • Loose or disconnected sensor wire
  • Faulty or shorted temperature sensor
  • Sensor covered in dust or moisture
  • Corrosion or damage to the sensor terminals
  • Faulty control board unable to read sensor data

air-conditioner - Fixing CH02 Error Step-by-Step❓

  • Power Off the Unit

    1. Unplug the air conditioner or switch off the breaker
    2. Wait at least 5 minutes

  • Check Sensor Wiring

    1. Open the indoor panel and locate the coil sensor
    2. Ensure it’s connected firmly to the PCB board

  • Clean the Sensor

    1. Use a dry cloth to remove dust or moisture from the sensor
    2. Avoid using water directly

  • Replace the Sensor (if faulty)

    1. If the sensor looks damaged, it may need replacement
    2. Use the correct sensor for your AC model

  • Call Technician if Needed

    1. If wiring and cleaning don’t resolve the issue, consult a technician to test the board and sensor

air-conditioner - Helpful Tips to Avoid CH02 Error

  • Keep the sensor and wiring area clean
  • Avoid overcooling the room, which can stress sensors
  • Do not spray water into the indoor unit
  • Turn off power before inspecting internal parts
  • Get annual maintenance to catch sensor issues early

Common Questions About CH02 Error❓

Question: Can I use the AC with the CH02 error showing?
Answer: It’s not recommended. The unit may not cool properly and can cause further damage.
Question: Is it safe to clean the sensor myself?
Answer: Yes, if the power is off and you use a dry cloth. Avoid liquids.
Question: How much does a sensor replacement cost?
Answer: Usually between ₹300–₹1000 depending on the model and brand.

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