Error code – LG A2UH243FA0(LMU240HE) User Manual

Page 72

72 Multi type Air Conditioner

Troubleshooting Guide

Error Code

■ Trouble Shooting

Error

Title

Cause of error

Check point & Normal condition

code

Indoor air sensor

Indoor inlet pipe sensor

Indoor outlet pipe sensor

• Open / Short
• Soldered poorly
• Internal circuit error

Normal resistor : 10K

Ω / at 25°C (Unplugged)

Normal voltage : 2.5Vdc / at 25°C (plugged)

Normal resistor : 5K

Ω/ at 25°C (Unplugged)

Normal voltage : 2.5Vdc / at 25°C (plugged)

Normal resistor : 5K

Ω/ at 25°C (Unplugged)

Normal voltage : 2.5Vdc / at 25°C (plugged)

Ω

10K

Ω

2.5Vdc

Check the resistance / voltage

❑ Check Point

1. Unplug the sensor on Indoor unit PCB.

2. Estimate the resistance of each sensor

3. If the resistance of the sensor is 10K

Ω/5KΩ at 25°C, then sensor is normal

4. If the resistance of the sensor is 0 K

Ω or ∞, then sensor is abnormal. ➔ Change the sensor.

5. Plug the sensor on Indoor unit PCB and Power ON.

6. Estimate the voltage of each sensor.

7. If the voltage of the sensor is 2.5Vdc / at 25°C, then sensor is normal.

8. If the resistance of the sensor is 0 or 5Vdc, then sensor is abnormal.

➔ Repair or Change the PCB