Troubleshooting Ch05, Ch53 - LG General Wall Mounted-Inverter Type Svc Manual

2) Troubleshooting CH05, CH53

Error
Title
code
05
Communication
/
(Indoor ¡ Outdoor)
53
Cause of error
• Communication poorly
Check Point
1. 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.
Part 4 Trouble Shooting
Check point & Normal condition
• 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.
Service Manual 57