Troubleshooting Guide
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Copyright ©2013 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
75*
Master(751)
Slave1(752)
Slave2(753)
Slave3(754)
Fan CT Sensor Error
Offset of Micom which
sensor the fan motor
phase current is not
2.5V
1. Input Voltage is abnormal (not 15V)
2. Fan PCB assembly defect
3. Power wire open and connecting fault
4. Inverter PCB assembly defect
Is input voltage normal?
No
1. Check 15V input power wiring conditions
Rewire them if abnormality found
1. Replace Fan PCB
No
Is Fan PCB normal?
Yes
1. Replace Fan PCB
No
Is there any error
When power reset?
Yes
Yes
Recheck Power and
Installation Condition
15V Input power on Inverter PCB
15V Input power wiring conditions
Check short of power wire
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