LG A2UN186FA0 Service Manual page 102

The problem of missing the connector (INDOOR MAIN PCB ASSY)
Connectors
CN-POWER (1,2)
CN-POWER (3)
CN-FAN
CN-DISP1
CN-TH
CN-U/D
Condition
OPEN
OPEN
OPEN
OPEN
OPEN/SHORT
OPEN
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Problem (error mode)
• Malfunctions all indoor & outdoor unit.
• Malfunctions remocon, force, test operation mode.
• Malfunctions outdoor unit.
• Stop compressor and outdoor fan motor.
• The operation LED blinks 5 times.
• Communicaion error.
• Malfunctions indoor fan motor.
• Malfunctions remote controller.
• Don't operate the power display module.
• The operation LED blinks once.
• Enable to receive remote singnal.
• Malfunctions UP/DOWN step motor.
• Don't operate louver.