Error Code CH10 in Air Conditioners

The CH10 error code in air conditioners is linked to issues with the indoor unit fan, which operates alongside electronic boards commonly referred to as gate pulse (PG) boards.

Before attempting any procedure to address a fan issue, it is recommended to:

1. Inspect the condition of the turbine.
2. Check the state of the connections.
3. Ensure the cleanliness of the board and electrical components powering the fan.
4. Assess the fan’s rotational speed to rule out problems with the Hall effect sensor.

Below, we will concisely explain everything you need to understand and resolve this error code:

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Understanding the CH10 Error

The CH10 error is designated by LG as an issue with the indoor fan lock caused by a lack of feedback signal from the Hall effect sensor located in the turbine motor.

What is the Hall Effect Sensor?

The Hall effect sensor is a device that generates voltage when it detects a magnetic field proportional to the field’s strength. This sensor monitors the motor’s rotational speed near the rotor shaft and is connected to a section of the board.

• How it Works:
  • When the Hall effect sensor detects a series of rotations, the board confirms the motor is functioning correctly.
  • If the motor stops, for example, due to obstructions, the microcontroller will not receive the sensor signal, resulting in the system shutting down.

Connections of the Hall Effect Sensor

The sensor uses three thin wires independent of the motor’s power cables:

1. Power Supply Wire: Supplies voltage to the sensor, typically 5V but some motors use 12V.
2. Ground Wire: Connects the sensor to the ground.
3. Signal Wire: Transmits the feedback signal generated by the sensor.

To identify these wires:

• Use a multimeter to measure voltages between the pins.
• When the measurement shows approximately 5V or 12V, the pin touched by the red multimeter lead is the power supply, and the pin touched by the black lead is the ground. The third pin is the signal wire.

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Testing the Hall Effect Sensor

1. Once the signal wire is identified:
   • Place the red multimeter lead on the signal wire and the black lead on the ground.
   • Manually rotate the fan.
   • The multimeter should display a rapidly changing voltage signal as the fan rotates.
2. Results:
   • If a signal is present, the Hall effect sensor is functioning properly.
   • If no signal is detected, there is a problem with this component.

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Next Steps if the Sensor is Functional

If the sensor is working, focus on the electronic module for potential damage.

1. If No Signal is Detected:
   • Disassemble the motor, remove the rotor, and extract the Hall effect sensor.
   • Conduct a visual inspection for any visible damage.
2. Testing Electrical Resistance:
   • Use a multimeter to measure the electrical resistances on the sensor’s electronic board.
3. Replacement:
   • If no obvious electrical issues are found, inspect the sensor or its electronic board.
   • Verify the serial number of the part and obtain an identical replacement with the same serial number.