Error No. 79 - LG Multi V5 Service Manual

ERROR CODES

Error No. 79

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
79
Outdoor unit fan
Master: 791
operation error.
Slave 1: 792
Slave 2: 793
Is the fan motor assembly
correct?
The resistance between
each phase, and the insulation
resistance of the motor output
terminal correct?
Are the fan motor connections
correct?
Is the fan PCB assembly
correct?
Recheck power and installation.
178
Details
Outdoor unit fan motor is experiencing first
position sensor failure.
No
Yes
No
Yes
No
Yes
No
Yes
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1. Fan motor is defective or the assembly is
not correct.
2. Fan motor has disconnected (U,V,W out-
put).
3. Fan PCB is defective.
Check if the outdoor unit fan motor assembly is
correct or if it is locking up.
1. Check the 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-
nals (U,V,W) and the pipe (>100M).
1. Check if the color of the motor output terminal
(U,V,W) connections match the PCB connections.
2. Check for wiring damage, or if the wiring has discon-
nected.
Check if the fan PCB assembly IPM is correct.
found.
Causes
Large Frame
460V, 208V/230V, 460V,
60Hz, 60Hz, 60Hz,
3-phase 3-phase 3-phase
1,200 W 900 W 900 W