Check point – LG LCN240CP User Manual
Page 39
Service Manual 39
Troubleshooting Guide
Ω
10k
Ω
Check the resistance
Check the voltage
V
2.5Vdc
01
02
06
Indoor air sensor
Indoor inlet pipe sensor
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(77°F) (Unplugged)
Normal voltage : 2.5Vdc / at 25°C(77°F) (plugged)
Normal resistor : 5K
Ω/ at 25°C(77°F) (Unplugged)
Normal voltage : 2.5Vdc / at 25°C(77°F) (plugged)
Normal resistor : 5K
Ω/ at 25°C(77°F) (Unplugged)
Normal voltage : 2.5Vdc / at 25°C(77°F) (plugged)
Display
code
Title
Cause of error
Check point & Normal condition
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(77°F), 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(77°F), then sensor is normal.
8. If the resistance of the sensor is 0 or 5Vdc, then sensor is abnormal.
→ Repair or Change the PCB.
Troubleshooting CH01, CH02, CH06