LG General Wall Mounted-Inverter Type - Manual (Page 57)

Service Manual 57
Part 4 Trouble Shooting
2) Troubleshooting CH05, CH53
05
/
53
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
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 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 out-
door unit.