Self-Diagnosis Function; Troubleshooting Guide; Error Indicator; Error Display - LG Multi V Manual

Troubleshooting Guide

2.5 Self-Diagnosis Function

Error Indicator

• This function indicates types of failure in self-diagnosis and occurrence of failure for air condition.
• Error mark is displayed on display window of indoor units and wired remote controller, and 7-segment LED of
outdoor unit control board as shown in the table.
• If more than two troubles occur simultaneously, lower number of error code is first displayed.
• After error occurrence, if error is released, error LED is also released simultaneously.

Error Display

1st,2nd LED of 7-segment indicates error number, 3rd LED indicates unit number.
Display
0 1 -
Air temperature sensor of indoor unit
0 2 -
Inlet pipe temperature sensor of indoor unit
Transmission error : wired remote
0 3 -
controller
0 4 -
Drain pump
Transmission error : outdoor unit
0 5 -
↔ indoor unit
Outlet pipe temperature sensor of
0 6 -
indoor unit
Different operation mode
0 7 -
0 9 -
Serial No.
1 0 -
Poor fan motor operation
Transmission error: indoor unit ¡
1 1 -
main PCB of outdoor.
Outdoor Unit Inverter Compressor
2 1 1
IPM Fault
Inverter Board Input Over
2 2 1
Current(RMS) of Outdoor Unit
Outdoor Unit Inverter Compressor
2 3 1
DC link Low Voltage
Outdoor Unit High Pressure
2 4 1
Switch
Outdoor Unit Input Voltage High/
2 5 1
Low Voltage
Outdoor Unit Inverter Compressor
2 6 1
Start Failure
PSC/PFC Fault error
2 7 1
Outdoor Unit Inverter DC link High
2 8 1
Voltage
Outdoor Unit Inverter Compressor
2 9 1
Over Current
Copyright ©2008 LG Electronics. Inc. All right reserved.
Only for training and service purposes
Title
↔ indoor unit
- 60 -
Cause of Error
Air temperature sensor of indoor unit is open or short
Inlet pipe temperature sensor of indoor unit is open or short
Failing to receive wired remote controller signal in
indoor unit PCB
Malfunction of drain pump
Failing to receive outdoor unit signal in indoor unit PCB
Outlet pipe temperature sensor of indoor unit is
open or short
Operation mode between indoor unit and outdoor unit
is different
In case when the serial number marked on
EEPROM of Indoor unit is 0 or FFFFFF
Disconnecting the fan motor connector/Failure of indoor fan
motor lock
When the addressing signal doesn't respond for 3mins. suddenly,
while the indoor unit gets the calling signal from the outdoor unit,
Outdoor Unit Inverter Compressor Drive IPM Fault
Outdoor Unit Inverter Board Input Current excess
(RMS)
DC charging is not performed at outdoor unit after
starting relay turn on.
System is turned off by outdoor unit high pressure
switch.
Outdoor Unit input voltage is out of range.
The First Start Failure by Outdoor Unit Inverter
Compressor Abnormality
When over current flows instantly at PSC/PFC
System is turned off by outdoor unit DC Voltage Over
Charging
Outdoor Unit Inverter Compressor Fault OR Drive
Fault
LGE Internal Use Only