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Error code check
29
(291)
Inverter compressor over
current
Error
No.
Error Type
Error Point
Main Reasons
Inverter compressor input
current is over 30 A
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
n
Error Diagnosis and Countermeasure Flow Chart
Is installation
condition normal?
No
Yes
Recheck power and installation condition
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
Are the resistance
Between each phase and
insulation resistance of Inverter
compressor normal?
No
Yes
1.Check resistance between each terminal of compressor
2.Check insulation resistance between compressor terminal
and pipe (over 50 M)
→
Replace compressor if abnormality found
Is compressor
Wire connection
condition normal?
No
Yes
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
Is input voltage normal?
No
Yes
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
Is inverter PCB assembly normal?
No
Check inverter PCB assembly IPM normality
→
Replace inverter PCB assembly
Yes
* Measuring resistance between
each terminal of compressor
* Compressor wire connection
*Measuring input voltage
Compressor
JQC068MA*
Temp.
U-V
V-W
W-U
25℃
0.216 ± 7% Ω
0.216 ± 7% Ω
0.216 ± 7% Ω
75℃
0.258 ± 7% Ω
0.258 ± 7% Ω
0.258 ± 7% Ω
R(L1)
S(L2)
T(L3)
N
