LG MULTI V M ARNU07GTU 4 Series Svc Manual page 60

Troubleshooting Guide
Error
Error Type
No.
221 AC Input Current Over Error
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 Inv. PCB
bridge diode joining condition normal?
Yes
Is input voltage normal?
Yes
Is Inv. PCB
normal?
Yes
Recheck power and installation condition
Error Point
Inv. PCB input 3 phase
power
current is over limited
value(24A)
1. Check Pipe clogging/distortion
2. Check Covering (Indoor/MULTI V M)
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 (Refer to the right side tables.)
No
2. Check insulation resistance between compressor
terminal and pipe (over 50m)
→ Replace compressor if abnormality found
1. Check Inv. PCB U,V,W connector
connection condition
No
2. Check wire disconnection and wiring
3. Check compressor terminal connection condition
(bad contact)
→ Reassemble if abnormality found
Check joining condition of Inv. PCB and bridge diode
No
→ 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 Inv. PCB IPM normality
→ Replace Inv. PCB
- 60 -
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. Inv. PCB damage
(Input current sensing part)
RJA036MAA
Temp
U-V 0.529 ± 7% Ohms 0.631 ± 7% Ohms
V-W 0.529 ± 7% Ohms 0.631 ± 7% Ohms
W-U 0.529 ± 7% Ohms 0.631 ± 7% Ohms
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