LG Multi V Service Manual

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All rights reserved. Only training and service purposes.
Self-diagnosis function
n Error diagnosis and countermeasure flow chart
1. Bad connection of air temperature connector
2. Defect of air temperature connector(Open/Short)
3. Defect of outdoor PCB
1. Bad connection of air temperature connector
2. Defect of air temperature connector(Open/Short)
3. Defect of outdoor PCB
1. Bad connection of air temperature connector
2. Defect of air temperature 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)
Abnormal value of
sensor (Open/Short)
Sensor error of
outdoor air temper-
ature
Piping temperature
sensor error of heat
exchanger in
master & slave out-
door unit heat
exchanger (A,B)
Compressor suc-
tion temperature
sensor error
44
46
45
Is sensor connected
to PCB correctly??
Is sensor value correct?*
Connect sensor to PCB correctly
Replace sensor
Replace corresponding
outdoor unit PCB
Yes
No
No
Yes
* If value is 100 kΩ ↑(open) or 100 Ω ↓(short), error occurs
NB: Resistance value of temperature sensor change according to
temperature
It is normal if value shown as below (±5 % error)
Sensor of air temperature: 10 °C = 20.7 kΩ : 25 °C= 10 kΩ : 50 °C= 3.4 kΩ
Sensor of piping temperature: 10 °C = 10 kΩ : 25 °C= 5 kΩ : 50 °C= 1.8 kΩ

LG Multi V Specifications

General

Type	VRF (Variable Refrigerant Flow)
Compressor Type	Scroll
Refrigerant	R410A
Energy Efficiency	High
Control System	Centralized and individual control options
Indoor Units	Multiple types available (e.g., ceiling cassette, wall-mounted, ducted)