Troubleshooting Guide
- 123 -
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Only for training and service purposes
LGE Internal Use Only
1.Fan motor defect/ assemble condition abnor-
mal
2.Fan motor connector misconnection(U,V,W
ouput)
3.Fan PCB defect
Error No. Error Type Error Point Main Reasons
Fan Motor initial starting failure
Fan Starting Failure
Error
79*
Master 791
Slave1 792
Slave2 793
Slave3 794
n Error Diagnosis and Countermeasure Flow Chart
Is fan motor connection
condition normal?
1. Check if color of motor output terminal(U,V,W) connector matched with PCB’s
2. Check wire disconnection and wiring
→ Reassemble or replace if abnormality found
Is fan PCB assembly normal?
Yes
No
Recheck power and
installation condition
Yes
No
1.Check resistance between each motor output terminal
LG motor : 8.8Ω±10%(25℃)
Panasonic : 8.8Ω±10%(25℃)
2. Check insulation resistance between ODU fan motor terminal(U,V,W) and pipe (over 100M )
→Replace fan motor if abnormality found
No
Are the resistance
Between each phase and insulation
resistance of motor output
terminal normal?
Check ODU fan motor assemble condition and locking
→ Reassemble or replace if abnormality found
No
Is fan motor assemble
condition normal?
Fan motor wire connection
Measuring fan motor
phase resistance
Check fan PCB assembly IPM normal
→ Replace Fan PCB assembly
Check
Point
Measuring insulation resistance
between fan terminal & chassis
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