Troubleshooting Ch05, Ch53, Check Point | LG LCN240CP User ...

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42 Ceiling Cassette Air Conditioner

Troubleshooting Guide

Troubleshooting CH05, CH53

05

/

53

Communication

(Indoor

→ Outdoor)

• Communication poorly

• Power input AC 220V. (Outdoor, Indoor)• The connector for transmission is disconnected.• The connecting wires are misconnected. • The GND1,2 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.

Display

code

Title

Cause of error

Check point & Normal condition

Check Point

1. Check the input power AC230V. (Outdoor, Indoor unit)

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

Ω)

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.

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