Troubleshooting Guide

 

 

 

 

 

Error

Title

Cause of error

Check point & Normal condition

 

code

 

 

 

 

 

 

 

 

 

 

 

 

 

• Power input AC 230V.(Outdoor, Indoor)

 

 

 

 

• The connector for transmission is disconnected.

 

05 / 53

Communication

 

• The connecting wires are misconnected.

 

(Indoor Outdoor)

• Communication poorly

• The GND 1,2 is not connected at main GND.

 

 

 

 

 

 

• The communication line is shorted at GND.

 

 

 

 

• Transmission circuit of outdoor PCB is abnormal.

 

 

 

 

• Transmission circuit of indoor PCB is abnormal.

 

 

 

 

 

 

Check Point

1.Check the input power AC 230V.(Outdoor, Indoor)

2.Check the communication wires are correctly connected.

Adjust the connection of wire

Confirm the wire of "Live", "Neutral".

3.Check the resistance between communication line and GND.(Normal : Over 2M)

4.Check the connector for communication is correctly connected.

5.Check the connection of GND1, GND2, and main GND.

6.If one indoor unit is operated normally, outdoor PCB is no problem.

Check the another indoor unit.

* CH05 is displayed at indoor unit, CH53 is displayed at outdoor unit.

Service Manual 73

Page 73
Image 73
LG Electronics AMNC093APM0(LMAN090CNS) Power input AC 230V.Outdoor, Indoor, Communication line is shorted at GND

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