ELECTRICAL WIRING
71
ENGLISH
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,3rd LED of 7-segment indicates error number, 4th LED indicates unit number.
Ex)
Display Title Cause of Error
Indoor unit related error
0 1 - Air temperature sensor of indoor unit
Air temperature sensor of indoor unit is open or
short
0 2 -
Inlet pipe temperature sensor of indoor
unit
Inlet pipe temperature sensor of indoor unit is open
or short
0 3 -
Communication error : wired remote
controller ↔ indoor unit
Failing to receive wired remote controller signal in
indoor unit PCB
0 4 - Drain pump Malfunction of drain pump
0 5 -
Communication error : outdoor unit ↔
indoor unit
Failing to receive outdoor unit signal in indoor unit
PCB
0 6 -
Outlet pipe temperature sensor of
indoor unit
Outlet pipe temperature sensor of indoor unit is
open or short
0 9 - Indoor EEPROM Error
In case when the serial number marked on
EEPROM of Indoor unit is 0 or FFFFFF
1 0 - Poor fan motor operation
Disconnecting the fan motor connector/Failure of
indoor fan motor lock
Outdoor unit related error
2 1 1
Outdoor Unit Inverter Compressor IPM
Fault
Outdoor Unit Inverter Compressor Drive IPM Fault
2 2 1
Inverter Board Input Over
Current(RMS) of Outdoor Unit
Outdoor Unit Inverter Board Input Current excess
(RMS)
2 3 1
Outdoor Unit Inverter Compressor DC
link Low Voltage
DC charging is not performed at Outdoor Unit after
starting relay turn on.
2 4 1 Outdoor Unit High Pressure Switch
System is turned off by Outdoor Unit high pressure
switch.
2 5 1
Outdoor Unit Input Voltage High/ Low
Voltage
Outdoor Unit input voltage is over 487V or below
270V
No. of Error Compressor
Error No.
No. of Error Unit
Repeat
* Refer to the Indoor manual for some Indoor Error code.
1,MFL67798020, 2018. 4. 26. 7:06 Page 71
www.lgcomfortcooling.co.uk
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