Troubleshooting Guide

TroubleshootingCH01,CH02,CH06

Display

Title

 

 

 

Cause of error

 

 

 

 

Check point & Normal condition

code

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Indoor air sensor

 

• Open / Short

Normal resistor : 10K/ 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 :

5K/ 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 :

5K/ 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

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

10k

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 10K/ 5Kat 25°C(77°F), then sensor is normal.

4.If the resistance of the sensor is 0 Kor , 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

Page 39
Image 39
LG Electronics LCN240CP service manual Troubleshooting CH01, CH02, CH06, Check Point

LCN240CP specifications

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