LG Electronics LCN240CP service manual Troubleshooting CH01, CH02, CH06, Check Point

Troubleshooting Guide

TroubleshootingCH01,CH02,CH06

Display	Title		Cause of error		Check point & Normal condition
code
	Indoor air sensor	• Open / Short		Normal resistor : 10KΩ/ at 25°C(77°F) (Unplugged)
01		• Soldered poorly
				Normal voltage : 2.5Vdc / at 25°C(77°F)			(plugged)
		• Internal circuit error
		• Open / Short		Normal resistor :		5KΩ/ at 25°C(77°F) (Unplugged)
02	Indoor inlet pipe sensor	• Soldered poorly
				Normal voltage : 2.5Vdc / at 25°C(77°F)			(plugged)
		• Internal circuit error
		• Open / Short		Normal resistor :		5KΩ/ at 25°C(77°F) (Unplugged)
06	Indoor outlet pipe sensor	• Soldered poorly
				Normal voltage : 2.5Vdc / at 25°C(77°F) (plugged)
		• Internal circuit error

10kΩ

Ω

Check the resistance

2.5Vdc

V

Check the 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(77°F), 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(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.

Service Manual 39