LG MULTI V 5 Manual Book page 48

Error
Error No. Error Type Error Point
Error Type Error Point
No.
22*
Master
Inverter PCB Assembly
221
AC Input Current Over input 3 phase power
Inverter PCB Assembly
Slave1
22*
input 3 phase power
Error current is over limited
222 AC Input Current Over Error
current is over limited
value(24A)
Slave2
value(24A)
223
Slave3
224
n Error Diagnosis and Countermeasure Flow Chart
Is installation No
condition normal?
Yes
Are the resistance
No
Between each phase and
insulation resistance of Inverter
compressor normal?
Yes
Is compressor
No
Wire connection
condition normal?
Yes
No
Is Inverter PCB assembly
bridge diode joining condition normal?
Yes
No
Is input voltage normal?
Yes
No
Is Inverter PCB assembly
normal?
Yes
Recheck power and installation condition
Copyright ©2017 LG Electronics. Inc. All right reserved.
Only for training and service purposes
094
_TROUBLE SHOOTING GUIDE BOOK
Main Reasons
Main Reasons
1. Overload operation (Pipe clogging/
Covering/EEV defect/Ref. over-
1. Overload operation (Pipe
charge)
clogging/Covering/EEV defect/Ref.
overcharge)
2. Compressor damage(Insulation dam-
2. Compressor damage(Insulation age/Motor damage)
damage/Motor damage)
3. Input voltage low
3. Input voltage low
4. Power Line Misconnection
4. Power Line Misconnection
5. Inverter PCB Assembly damage
5. Inverter PCB Assembly damage
(Input current sensing part)
(Input current sensing part)
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
(U-V:0.255 ±7%, V-W:0.255 ±7%, W-U:0.255 ±7%(75℃)
Compressor JQC068MA* JQC048MA*
Temp. 25℃ 75℃ 25℃ 75℃
U-V 0.216 ± 7% Ω 0.258 ± 7% Ω 0.302 ± 7% Ω 0.360 ± 7% Ω
V-W 0.216 ± 7% Ω 0.258 ± 7% Ω 0.302 ± 7% Ω 0.360 ± 7% Ω
W-U 0.216 ± 7% Ω 0.258 ± 7% Ω 0.302 ± 7% Ω 0.360 ± 7% Ω
2. Check insulation resistance between compressor
terminal and pipe (over 50M )
→ Replace compressor if abnormality found
1. Check Inverter PCB assembly U,V,W connector
connection condition
2. Check wire disconnection and wiring
3. Check compressor terminal connection condition
(bad contact)
→ Reassemble if abnormality found
Check bridge diode in IGBTM of Inverter PCB
→ joining again if abnormality found
Check
R~S/S~T/T~R phase voltage is 380V 10%
R~N/S~N/T~N phase voltage is 220V 10%
→ Check connection condition and wiring if power is
abnormal
Check Inverter PCB assembly IPM normality
→ Replace Inverter PCB assembly
- 110 -
LGE Internal Use Only
* Measuring resistance between
* Measuring input voltage
each terminal of compressor
R(L1) S(L2)
* Compressor wire connector
connection
Copyright ©2017 LG Electronics. Inc. All right reserved.
Only for training and service purposes
T(L3) N
- 111 -
LGE Internal Use Only
095
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