Self-Diagnosis Function - LG MULTI V Service Manual

Self-diagnosis function

3. 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
0 1 Air temperature sensor of indoor unit
0 2 Inlet pipe temperature sensor of indoor unit
Communication error : wired remote
0 3
controller ↔ indoor unit
0 4 Drain pump
5 Communication error : outdoor unit ↔
0
indoor unit
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
1 0 Poor fan motor operation
2 1 Outdoor Unit Inverter Compressor IPM Fault
Inverter Board Input Over Current(RMS)
2 2
of Outdoor Unit
3 Outdoor Unit Inverter Compressor DC link
2
Low Voltage
2 4 Outdoor Unit High Pressure Switch
2 5 Outdoor Unit Input Voltage High/ Low Voltage Outdoor Unit input voltage is over 487 V or below 270 V
6 Outdoor Unit Inverter Compressor Start
2
Failure
Outdoor Unit Inverter Compressor Over
2 9
Current
Outdoor Unit Inverter Compressor1 High
3 2
Discharge Temperature
3 4 High Pressure of Outdoor Unit
3 5 Low Pressure of Outdoor Unit
Title
- 100 -
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
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
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.
The First Start Failure by Outdoor Unit Inverter Compressor
Abnormality
Outdoor Unit Inverter Compressor Fault OR Drive Fault
Outdoor Unit Inverter Compressor1 High Discharge
Temperature
High Pressure of Outdoor Unit
Low Pressure of Outdoor Unit
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