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