LG MULTI V IV ARNU07GTU 2 Series Service Manual page 90

Troubleshooting Guide
Error
Error Type
No.
22*
Master
221
Slave1
222 AC Input Current Over Error
Slave2
223
Slave3
224
n Error Diagnosis and Countermeasure Flow Chart
Is installation
condition normal?
Yes
Are the resistance
Between each phase and
insulation resistance of Inverter
compressor normal?
Yes
Is compressor
Wire connection
condition normal?
Yes
Is converter PCB assembly
bridge diode joining condition normal?
Yes
Is input voltage normal?
Yes
Is Comp PCB assembly
normal?
Yes
Recheck power and installation condition
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Only for training and service purposes
Error Point
Converter PCB Assembly
input 3 phase power
current is over limited
value(24A)
1. Check Pipe clogging/distortion
2. Check Covering (Indoor/Outdoor Unit)
No
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℃)
No
2. Check insulation resistance between compressor
terminal and pipe (over 50M )
→ Replace compressor if abnormality found
1. Check Comp PCB assembly U,V,W connector
connection condition
2. Check wire disconnection and wiring
No
3. Check compressor terminal connection condition
(bad contact)
→ Reassemble if abnormality found
Check joining condition of converter PCB assembly and
No
bridge diode
→ joining again if abnormality found
Check
No
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
No Check Comp PCB assembly IPM normality
→ Replace Comp PCB assembly
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Main Reasons
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. Converter PCB Assembly damage
(Input current sensing part)
LGE Internal Use Only