LG MULTI V IV ARNU12GTU 2 Series User Manual

Troubleshooting Guide
- 122 -
Copyright ©2013 LG Electronics. Inc. All right reserved.
Only for training and service purposes
LGE Internal Use Only
1. Overload operation
2. Fan Motor defect
3. Fan PCB assembly defect
4. Fan Motor connector insert defect
5. Condenser icing or blocking
Error No. Error Type Error Point Main Reasons
Output current is over 5A for 40ms
Fan Over Current Error
77*
Master 771
Slave1 772
Slave2 773
Slave3 774
n Error Diagnosis and Countermeasure Flow Chart
No
Is installation
condition normal?
Is motor wire 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?
Yes
Check ODU fan motor assemble condition and locking
→ Reassemble or replace if abnormality found
Fan left(1) Fan right(2)
Measuring fan motor phase
resistance
1. Check fan PCB assembly IPM normal
→ Replace Fan PCB assembly

LG MULTI V IV ARNU12GTU 2 Series Specifications

General

Brand	LG
Model	MULTI V IV ARNU12GTU 2 Series
Category	Air Conditioner
Language	English