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Part 5. Trouble Shooting

- 54 -

Only for training and service purposes

LGE Internal Use Only

Check the Volt.

Indoor Unit

12Vdc

12V S GND

Check the Volt.

Wired R/C

12Vdc

12V S GND

CN-REMO

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

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

LG LMN078HVT User Manual

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