CH05 and CH53 error codes | Troubleshooting LG Comercial air conditioning

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LG's Error codes CH05 and CH53 - Communication error.

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 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 outdoor unit.

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