LG LMU240HE Service Manual - Page 72

Error Code

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Troubleshooting Guide Error Code I Trouble Shooting Error code Title 01 Indoor air sensor 02 Indoor inlet pipe sensor 06 Indoor outlet pipe sensor Cause of error • Open / Short • Soldered poorly • Internal circuit error • Open / Short • Soldered poorly • Internal circuit error • Open / Short • Soldered poorly • Internal circuit error Check point & Normal condition Normal resistor : 10KΩ / at 25°C (Unplugged) Normal voltage : 2.5Vdc / at 25°C (plugged) Normal resistor : 5KΩ/ at 25°C (Unplugged) Normal voltage : 2.5Vdc / at 25°C (plugged) Normal resistor : 5KΩ/ at 25°C (Unplugged) Normal voltage : 2.5Vdc / at 25°C (plugged) 10KΩ Ω 2.5Vdc V 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 10KΩ/5KΩ at 25°C, then sensor is normal 4. If the resistance of the sensor is 0 KΩ 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 72 Multi type Air Conditioner

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72
Multi type Air Conditioner
Troubleshooting Guide
Error Code
■
Trouble Shooting
Error
Title
Cause of error
Check point & Normal condition
code
01
Indoor air sensor
02
Indoor inlet pipe sensor
06
Indoor outlet pipe sensor
•
Open / Short
•
Soldered poorly
•
Internal circuit error
•
Open / Short
•
Soldered poorly
•
Internal circuit error
•
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
V
❑
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
/5K
Ω
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