Multi F Four-Way Ceiling Cassette Service Manual

- 51 -
Copyright ©2014 LG Electronics. Inc. All right reserved.
Only for training and service purposes
LGE Internal Use Only
Part 5. Trouble Shooting
Check the Volt.
Indoor Unit
V
12Vdc
12V S GND
Check the Volt.
Wired R/C
V
12Vdc
12V S GND
CN-REMO
03
Communication
Wired R/C
• Open / Short
• Wrong connection
• Connection of wire
• Main PCB Volt. DC12V
• Noise interference
Display
code
Title Cause of error Check point & Normal condition
Check Point
1. Check the wire connection. (Open / Short) → Repair the connection
2. Check the soldering state of connector. (Soldered poorly) → Repair or Change the PCB.
3. Check the volt. Of main PCB power source. (DC 12V) → Repair or Change the main PCB.
4. Check the installation of wired remote controller. (Noise interference) → Adjust the state of installation