LG Multi V Service Manual

- 117 -
Copyright © 2020 LG Electronics Inc.
All rights reserved. Only training and service purposes.
Self-diagnosis function
26
Inverter compressor starting
failure Error
Error
No.
Error Type Error Point Main Reasons
Starting failure because of
compressor abnormality
1. Overload operation
(Pipe clogging/Covering/EEV defect/Ref.
overcharge)
2. Compressor damage
(Insulation damage/Motor damage)
3. Compressor wiring fault
4. Inv. PCB damage (CT)
n Error Diagnosis and Countermeasure Flow Chart
Is installation
condition normal?
No
Yes
Yes
Recheck power and installation condition
1. Check Pipe clogging/distortion
2. Check Covering (Indoor/Outdoor Unit)
3. Check EEV connector assemble condition/normal
operation
4. Check refrigerant pressure
→ Reassemble or manage if abnormality found
1. Check resistance between each terminal of
compressor (Refer to the right side tables.)
2. Check insulation resistance between compressor
terminal and pipe (over 50 m)
→ Replace compressor if abnormality found
Are the resistance
Between each phase and
insulation resistance of Inverter
compressor normal?
No
Yes
No
Yes
1. Check Inv. PCB U,V,W connector
connection condition
2. Check wire disconnection and wiring
3. Check compressor terminal connection condition
(bad contact)
→ Reassemble if abnormality found
Is compressor
Wire connection
condition normal?
No
Yes
Check Inv. PCB IPM normality
→ Replace Inv. PCB
Is Inv. PCB normal?
No
Are there any power wire
connections normal?
1. Check L1(L)/L2(N) wiring condition
→ Rewire them if abnormality found.
JQC048MBC
Temp. 25 ℃[77 ℉] 75 ℃[167 ℉]
U-V 0.113±7 %Ω 0.135±7 %Ω
V-W 0.113±7 %Ω 0.135±7 %Ω
W-U 0.113±7 %Ω 0.135±7 %Ω

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)