LG ACHH Series Manual page 69

Error
Error Type
No.
29
Inverter compressor over
(291)
current
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 input voltage normal?
Yes
Is inverter PCB assembly normal?
Yes
Recheck power and installation condition
* Measuring resistance between
each terminal of compressor
Error Point
Inverter compressor input
current is over 30 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
Compressor
No
2.Check insulation resistance between compressor terminal
and pipe (over 50 M)
→ Replace compressor if abnormality found
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
No
Check R~S/S~T/T~R phase voltage 380-415 V ± 10 %,
R~N/S~N/T~N phase voltage 220 ± 10%
→ Check connection condition and wiring if power is
abnorma
No Check inverter PCB assembly IPM normality
→ Replace inverter PCB assembly
* Compressor wire connection
R(L1) N
S(L2) T(L3)
- 69 -
Main Reasons
1. Overload operation
(Pipe clogging/Covering/EEV defect/Ref.
overcharge)
2. Compressor damage(Insulation
damage/Motor damage)
3. Input voltage low
4. ODU inverter PCB assembly damage
JQC068MA*
Temp. 25℃
U-V 0.216 ± 7% Ω 0.258 ± 7% Ω
V-W 0.216 ± 7% Ω 0.258 ± 7% Ω
W-U 0.216 ± 7% Ω 0.258 ± 7% Ω
*Measuring input voltage
Error code check
75℃