Error Display - LG ARUN Series Service Manual

3. Self-diagnosis function
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.
Ex) 211 : No.21 error of master unit
213 : No.21 error of slave2
011 ¡ 051 : No.105 error of master unit
Display
0 1 -
Air temperature sensor of indoor unit
0 2 - Inlet pipe temperature sensor of indoor unit
Communication error : wired remote controller
0 3 -
↔ indoor unit
0 4 - Drain pump
Communication error : outdoor unit ↔ indoor
0 5 -
unit
Outlet pipe temperature sensor of indoor unit
0 6 -
Different operation mode
0 7 -
Serial No.
0 9 -
Poor fan motor operation
1 0 -
Communication error: indoor unit ¡ main PCB
1 1 -
of outdoor.
Master Outdoor Unit Inverter Compressor
1
IPM Fault
2 1
Slave Outdoor Unit Inverter Compressor IPM
2
Fault
Inverter Board Input Over Current(RMS) of
1
Master Outdoor Unit
2 2
Inverter Board Input Over Current(RMS) of
2
Slave Outdoor Unit
Master Outdoor Unit Inverter
1
Compressor DC link Low Voltage
2 3
Slave Outdoor Unit Inverter
2
Compressor DC link Low Voltage
Master Outdoor Unit High Pressure
1
Switch
2 4
Slave Outdoor Unit High Pressure
2
Switch
Copyright ©2007 LG Electronics. Inc. All right reserved.
Only for training and service purposes
Title
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,
Master Outdoor Unit Inverter Compressor Drive IPM Fault
Slave Outdoor Unit Inverter Compressor Drive IPM Fault
Master Outdoor Unit Inverter Board Input Current excess (RMS)
Slave Outdoor Unit Inverter Board Input Current excess (RMS)
DC charging is not performed at Master outdoor unit after
starting relay turn on.
DC charging is not performed at Slave outdoor unit after
starting relay turn on.
System is turned off by Master outdoor unit high pressure
switch.
System is turned off by Slave outdoor unit high pressure
switch.
- 71 -
Self-diagnosis function
Cause of Error
LGE Internal Use Only