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Service Manual 39
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