LG LCU240CP Service Manual - Page 40
Troubleshooting CH03
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Troubleshooting Guide Troubleshooting CH03 Display code Title Cause of error 03 Communication Wired R/C • Open / Short • Wrong connection Check point & Normal condition • Connection of wire • Main PCB Volt. DC12V • Noise interference Wired R/C 12V S GND Indoor Unit 12V S GND 12Vdc V 12Vdc V Check the Volt. Check the Volt. 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, DC 5V) ¡ Repair or Change the main PCB. 4. Check the installation of wired remote controller. (Noise interference) ¡ Adjust the state of installation 40 Ceiling Cassette Air Conditioner
40
Ceiling Cassette Air Conditioner
Troubleshooting Guide
Troubleshooting CH03
Check the Volt.
Indoor Unit
V
12Vdc
12V
S
GND
Check the Volt.
Wired R/C
V
12Vdc
12V
S
GND
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, DC 5V)
→
Repair or Change the main PCB.
4. Check the installation of wired remote controller. (Noise interference)
→
Adjust the state of installation