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_TROUBLE SHOOTING GUIDE BOOK _
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Copyright ©2017 LG Electronics. Inc. All right reserved.
Only for training and service purposes
LGE Internal Use Only
n Error diagnosis and countermeasure flow chart
Error No. Error Type Error Point Main Reasons
71*
Master 711
Slave1 712
Slave2 713
Slave3 714
PFC CT Sensor Error
Micom input voltage
isn’t within 2.5V±0.3V
at initial state of power
supply
1. Input Voltage is abnormal (R-N)
2. ODU Inverter PCB damage (CT sensing part)
Are there any power wire
Connections normal?
No
1. Check R/S/T/N wiring conditions
2. Check noise filer wiring conditions
Rewire them if abnormality found
Check
R~S/S~T/T~R phase voltage 380V±10%
R~N/S~N/T~N phase voltage 200V±10%
Check connection condition and wiring if power is abnormal
No
Is input voltage normal?
Yes
1. Replace Inverter PCB
No
Is Inverter PCB
Assembly normal?
Yes
Yes
Recheck Power and
Installation Condition
* Inverter PCB
* Measuring input voltage
R(L1) S(L2) T(L3) N
Error No. Error Type Error Point Main Reasons
71*
PFC CT Sensor
Error
Micom input volt
-
age isn't within
2.5V±0.3V at initial
state of power
supply
1. Input Voltage is abnormal (R-N)
2. ODU Inverter PCB damage (CT sensing part)
- 137 -
Copyright ©2017 LG Electronics. Inc. All right reserved.
Only for training and service purposes
LGE Internal Use Only
67*
Master 671
Slave1 672
Slave2 673
Slave3 674
Fan Lock Error
Error No. Error Type Error Point Main Reasons
Fan RPM is 10RPM or less
for 5 sec. when ODU fan
starts or 40 RPM or less
after fan starting.
1. Fan motor defect / assembly condition
abnormal
2. Wrong connection of fan motor connector
(U,V,W output)
3. Reversing rotation after RPM target apply
4. Fan PCB assembly defect
5. Fan lock by Heavy Snowfall.
n
Error Diagnosis and Countermeasure Flow Chart
Is ODU Fan Motor Assemble
condition normal?
No
Yes
Recheck power and installation condition
Check ODU Fan Motor assemble condition and fan locking
→ Reassemble or replace if abnormality found
Is ODU Fan Motor normal?
No
Yes
1. Check resistance between each phase(U,V,W) of ODU
fan motor terminal (16.8
Ω
±5% at 75°…)
2. Check insulation resistance between ODU fan motor
terminal(U,V,W)
→ Replace fan motor if abnormality found
Is wire connection of
ODU Fan Motor wire normal?
No
Yes
Check wiring between ODU fan motor and fan PCB
( Check if and Motor output terminal color is matched)
→ Reassemble if abnormality found
Is Fan PCB assembly normal?
No
Yes
Replace Fan PCB assembly
* Fan Motor resistance measuring
between each phase
* Fan motor wire connection
❈ When it has heavy snowfall, remove from product and then operate.
Error No. Error Type Error Point Main Reasons
67* Fan Lock Error
Fan RPM is 10RPM
or less for 5 sec.
when ODU fan starts
or 40 RPM or less
after fan starting.
1. Fan motor defect / assembly condition
abnormal
2. Wrong connection of fan motor connector
(U,V,W output)
3. Reversing rotation after RPM target apply
4. Fan PCB assembly defect
5. Fan lock by Heavy Snowfall.
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