LG MULTI V IV ARNU12GTU 2 Series User Manual

Troubleshooting Guide
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Only for training and service purposes
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n Error diagnosis and countermeasure flow chart
1. Bad connection of low pressure connector
2. Defect of low pressure connector (Open/Short)
3. Defect of outdoor PCB
1. Bad connection of high pressure connector
2. Defect of high pressure connector (Open/Short)
3. Defect of outdoor PCB
Error
No.
Error Type Error Point Main Reasons
Abnormal value of
sensor
(Open/Short)
Abnormal value of
sensor
(Open/Short)
Sensor error of low
pressure
Sensor error of high
pressure
42*
Master 421
Slave1 422
Slave2 423
Slave3 424
43*
Master 431
Slave1 432
Slave2 433
Slave3 434
Is sensor connected
to PCB correctly?
Connect sensor to PCB correctly
Yes
No
No
After replacement of
outdoor unit main PCB
is the system normal?
Yes
Replace corresponding
pressure sensor
END
Pressure sensor connector

LG MULTI V IV ARNU12GTU 2 Series Specifications

General

Brand	LG
Model	MULTI V IV ARNU12GTU 2 Series
Category	Air Conditioner
Language	English