LG Multi V Service Manual

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Copyright © 2020 LG Electronics Inc.
All rights reserved. Only training and service purposes.
Self-diagnosis function
AC Input Current Over Error22
Error
No.
Error Type Error Point Main Reasons
Inv. PCB input power
current is over limited
value(Cooling : 31 A,
Heating 34 A)
1. Overload operation (Pipe
clogging/Covering/EEV defect/Ref.
overcharge)
2. Compressor damage(Insulation
damage/Motor damage)
3. Input voltage low
4. Power Line Misconnection
5. Inv. PCB damage
(Input current sensing part)
n Error Diagnosis and Countermeasure Flow Chart
Is installation
condition normal?
No
Yes
Yes
Yes
Recheck power and installation condition
Yes
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
Is Inv. PCB
bridge diode joining condition normal?
No
Check joining condition of Inv. PCB and bridge diode
→ joining again if abnormality found
Yes
Is input voltage normal?
No
Check
1. L1(L) – L2(N) phase voltage is 220 V(±10 %) or
240 V(±10 %)
→ Check connection condition and wiring if power is
abnormal
Yes
Is Inv. PCB
normal?
No
Check Inv. PCB IPM normality
→ Replace Inv. PCB
Are the resistance
Between each phase and
insulation resistance of Inverter
compressor normal?
No
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
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

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)