LG FMN0760NL Service Manual page 89

Trouble 7-2
I Communication error between Indoor and Outdoor (Error Code
Does the operating LED in display PCB
Ass'y blink 5 times?
Is the voltage of CN-POWER Pin No. 1, 3
AC220/240V in Main PCB Ass'y.
Is the connection of CN-DATA between
indoor and outdoor unit right?
Replace the PCB Ass'y.
• Main PCB Ass'y (Indoor/Outdoor)
• Control Box Ass'y.
When compressor does not oprate normally.
YES
YES
YES
)
NO
• Check the state of connecting cable
(4 line) bewteen indoor and outdoor unit .
• Check Fuse, Noise Filter, PTC, etc.
NO
• Electrical wiring diagram(Colors)
• Check the connecting state
of connectors in outdoor PCB Ass'y
(Main/Sub)
• Check the Fuse of outdoor Control Box.
NO
• Reconnect the cable to terminal block.
• Check the PCB pattern(Resoldering).
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