Lg General Wall Mounted-Inverter Type User Manual download pdf (Page 57)

Service Manual 57

Part 4 Trouble Shooting

2) Troubleshooting CH05, CH53

Communication

(Indoor → Outdoor)

• Communication poorly

• Power input AC 208~230V. (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.

Error

code

Title Cause of error Check point & Normal condition

Check Point

Check the input power AC 208~230V. (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 2MΩ)

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 out-

door unit.

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Lg General Wall Mounted-Inverter Type User Manual Page 57