LG ACHH Series Manual page 63

Error
Error Type
No.
22 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 inverter PCB assembly
power connection normal?
Yes
Is input voltage normal?
Yes
Is inverter PCB assembly
normal?
Yes
Recheck power and installation condition
Error Point
Inverter PCB Assembly
input 3 phase power
current is over limited
value(24 A)
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 : 0.195 ± 7 % Ω, V-W : 0.195 ± 7 % Ω, W-U : 0.195 ± 7 % Ω (@25 ℃))
No
2. Check insulation resistance between compressor
terminal and pipe (over 50 M)
→ Replace compressor if abnormality found
1. Check inverter PCB assembly 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 connection between inverter PCB assembly and
No
bridge diode(misconnection, disconnection)
→ wiring again if abnormality found
Check R~S/S~T/T~R phase voltage 380-415 V ± 10 %,
No
R~N/S~N/T~N phase voltage 220 ± 10%
→ Check connection condition and wiring if power is
abnormal
No
Check inverter PCB assembly IPM normality
→ Replace inverter 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. Inverter PCB Assembly damage
(Input current sensing part)
Error code check