Self-Diagnosis Function - LG R410A Service Manual

Self-diagnosis function

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.
Display
Air temperature sensor of indoor unit
0 1
0 2 Inlet pipe temperature sensor of indoor unit
Transmission error : wired remote
0 3
controller ↔ indoor unit
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
Indoor LEV
0 8
Serial No.
0 9
Poor fan moto operation
1 0
Transmission error : indoor unit
1 1
¡ main PCB of outdoor.
2 1 DC peak
Overcurrent of inverter comp.
2 2
Poor voltage charge for driving
2 3
INV compressor
2 4
High pressure switch
2
Low/Over voltage
5
Discharge temperature
3 2
(INV compressor A)
Discharge temperature
3 3
(INV compressor B)
High pressure
3 4
Low pressure
3 5
124 Trouble Shooting Guide
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 at
indoor unit PCB
Malfunction of drain pump
Failing to receive outdoor unit signal at indoor unit PCB
Outlet pipe temperature sensor of indoor unit is
open or short
Operation mode between indoor unit and outdoor unit
is different
Malfunction of indoor LEV
In the case that the serial number marked on EEP-
ROM of indoor unit is 0 or FFFFFF
Disconnecting the fan motor connector/Failure or
indoor fan motor lock.
When the addressing signal doesn't come out for 3mins. suddenly, while
the indoor unit gets the calling signal coming from the outdoor unit.
IPM fault or overcurrent to compressor
Overcurrent flows to inverter compressor
DC charging is not performed after starting relay turn
on
System is off by high pressure switch
Input voltage is out of tolerable range.
System is off due to rising of INV compressor A discharge
temperature
System is off due to rising of INV compressor B
discharge temperature
System is off by excessive increase of high pressure
System is off by excessive decrease of low pressure
Cause of Error