LG MULTI V Service Manual page 102

Self-diagnosis function
Display
Outdoor Unit Liquid pipe Temperature Sensor
1 1 3
Error
Outdoor Unit Subcooling Outlet Temperature
1 1 5
Sensor Error
Outdoor Unit Discharge Super
1 5 0
Heat Low
Failure of operation mode conversion at
1 5 1
Outdoor Unit
2 0 0 1 Searching pipe Error
C +
2 0 1 #HR HR unit1 Liqiud sensor error
C +
2 0 2 #HR HR unit1 Sub Cooling Pipe In sensor error
C +
2 0 3 #HR HR unit1 Sub Cooling Pipe Out sensor error
C +
2 0 4 #HR Communication error
C + Communication error between HR unit and the
2 0 5
#HR upgraded 485 modem.
6 C +
2 0 #HR Duplicate address error of HR unit
7 C + Communication error between Master and
2 0
#HR Slave Main PCB of HR Unit
8 C +
2 0 #HR Communication error of EEPROM of HR Unit
C : HR unit
# : HR unit Number
# HR is the information in outdoor unit Main PCB segment
(HR unit is excluded from #HR related display on PCB segment)
CAUTION
• To use open line 485 communication (9,600 bps communication), you need to use a product in which all of the indoor
unit/HR unit/outdoor unit/accessory model can use (9,600 bps communication).
Title
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Cause of Error
Liquid pipe temperature sensor of Outdoor Unit is
open or short
Outdoor Unit Subcooling Outlet Temperature
Sensor Error
Outdoor Unit LowDischarge Super
Heat for 5 minutes
Failure of operation mode conversion at Outdoor
Unit
Failure of automatic addressing of valves
Liquid pipe sensor of HR unit open or short
Sub Cooling Pipe In sensor of HR unit open or
short
Sub Cooling Pipe Out sensor of HR unit. open or
short
Failing to receive HR unit signal at outdoor unit
4 series upgraded 485 communication error
between HR unit and HR unit modem
When the HR unit address is set duplicated at the
4 series upgraded 485 communication
When fail to communication between Master and
Slave Main PCB of HR Unit
When fail to communication of EEPROM of HR
Unit
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