LG Multi V Service Manual

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All rights reserved. Only training and service purposes.
Self-diagnosis function
29
Inverter compressor over
current
Error
No.
Error Type Error Point Main Reasons
Inverter compressor input
current is over 46 A
1. Overload operation
(Pipe clogging/Covering/EEV defect/Ref.
overcharge)
2. Compressor damage(Insulation
damage/Motor damage)
3. Input voltage low
4. Inv. PCB damage
n Error Diagnosis and Countermeasure Flow Chart
Is installation
condition normal?
No
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
Are the resistance
Between each phase and
insulation resistance of Inverter
compressor normal?
No
Yes
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
Is compressor
Wire connection
condition normal?
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 input voltage normal?
No
Yes
Check
L1(L) – L2(N) phase voltage is 220 V(±10 %) or
240 V(±10 %)
→ Check connection condition and wiring if power
is abnormal
Is Inv. PCB normal?
No
Check Inv. PCB IPM normality
→ Replace Inv. PCB
Yes

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)