Error No. 77 - LG Multi V5 Service Manual

Please refer to the Safety Precautions on pages 4-7 for more detail to prevent injury or death regarding the operation and service
WARNING
troubleshooting of the Multi V product.
Error No. Description
77
Outdoor unit fan
Master: 771
overcurrent error.
Slave 1: 772
Slave 2: 773
Is the installation correct?
The resistance
between each phase
and the insulation resistance of
the motor output terminal
correct?
Are the motor wire con-
nections correct?
Is the fan PCB assembly
correct?
Recheck power and installation.
Measure fan motor phase
resistance.
Outdoor unit fan current is >10A (for 208-230V
units) or 5A (for 460V units).
No
Yes
No
Yes
No
Yes
No
Yes
Due to our policy of continuous product innovation, some specifications may change without notification.
©LG Electronics U.S.A., Inc., Englewood Cliffs, NJ. All rights reserved. "LG" is a registered trademark of LG Corp.
Details
1. Overload operation.
2. Fan motor is defective.
3. Fan PCB assembly is defective.
4. Fan motor connector is not inserted
5. Condenser has iced up or is blocked.
Check if the outdoor unit fan motor assembly is correct or if it is
locking up.
1. Check resistance between each motor output terminal.
Small Frame
208V/230V,
Power Supply 60Hz,
3-phase
Rating Output 1,500 W
Motor Resistance
at 167°F
2. Check insulation resistance between the outdoor unit fan motor termi-
nal (U,V,W) and piping (over 100M).
1. Check if the color of the motor output terminal (U,V,W) connec-
tions match the PCB connections.
2. Check if the wiring has disconnected or has been damaged.
Check if the fan PCB assembly IPM is correct.
Images here are representative of system components. Actual compo-
nent appearance depends on model and system type.
ERROR CODES

Error No. 77

Causes
correctly.
Large Frame
460V, 208V/230V,
60Hz, 60Hz,
3-phase 3-phase
1,200 W 900 W
460V,
60Hz,
3-phase
900 W
177