LG MULTI V 5 Manual Book page 63

Error No. Error Type Error Point
Error No. Error Type Error Point
Offset of Micom
75*
which which sense
Offset of Micom which
Fan CT Sensor
Master
75* the fan motor phase
which sense the fan
Error
Slave1 Fan CT Sensor Error
current is not 2.5V motor phase current is
Slave2
not 2.5V ± 0.3V
± 0.3V
Slave3
n Error diagnosis and countermeasure flow chart
No
1. Check 15V input power wiring conditions
Is input voltage normal?
Rewire them if abnormality found
Yes
No
Is Fan PCB normal? 1. Replace Fan PCB
Yes
No
Is there any error 1. Check Fan PCB IPM normal or not.
When power reset? Replace Fan PCB
Yes
Recheck Power and
Installation Condition
Check DC input power 15V on Inverter PCB.
Copyright ©2017 LG Electronics. Inc. All right reserved.
Only for training and service purposes
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Main Reasons
Main Reasons
1. Input Voltage is abnormal (not 15V)
1. Input Voltage is abnormal (not 15V)
2. Fan PCB assembly defect
2. Fan PCB assembly defect
3. Power wire open and connecting fault
3. Power wire open and connecting fault
4. Inverter PCB assembly defect
4. Inverter PCB assembly defect
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Error No. Error No. Error Type Error Type Error Point
77*
Fan Over Current Output current is
Master 771
77*
Slave1 772 Fan Over Current Error Output current is over 7A.
Error over 7A.
Slave2 773
Slave3 774
n Error Diagnosis and Countermeasure Flow Chart
No
Check ODU fan motor assemble condition and locking
Is installation
→ Reassemble or replace if abnormality found
condition normal?
Yes
1. Check resistance between each motor output terminal
Are the resistance
No Chassis
Between each phase and insulation
Resistance
resistance of motor output
terminal normal?
2. Check insulation resistance between ODU fan motor terminal(U,V,W) and pipe (over 100M )
→ Replace fan motor if abnormality found
Yes
1.Check if color of motor output terminal(U,V,W) connector matched with PCB's
No
Is motor wire connection
2.Check wire disconnection and wiring
condition normal?
→ Reassemble or replace if abnormality found
No
1. Check fan PCB assembly IPM normal
Is Fan PCB assembly normal?
→ Replace Fan PCB assembly
Yes
Recheck power and
installation condition
Measuring fan motor phase
resistance
Copyright ©2017 LG Electronics. Inc. All right reserved.
Only for training and service purposes
Error Point Main Reasons Main Reasons
1. Overload operation
1. Overload operation
2. Fan Motor defect
2. Fan Motor defect
3. Fan PCB assembly defect
3. Fan PCB assembly defect
4. Fan Motor connector insert defect
4. Fan Motor connector insert defect
5. Condenser icing or blocking
5. Condenser icing or blocking
UXA UXB
15 ± 7 % Ω 13 ± 7 % Ω
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