Table of Contents
Advertisement
Display
4 6 * Master Outdoor Unit Suction
Temperature Sensor Fault
4 9 * Master Outdoor Unit Faulty IPM
Temperature Sensor
Omitting connection of R, S, T power of
*
5 0
Master Outdoor Unit
5 1 * Excessive capacity of indoor units
5 2 * Communication error : inverter PCB
→ Main PCB
5 3 * Communication error : indoor unit →
Main PCB of Outdoor Unit
5 7 * Communication error : Main PCB →
inverter PCB
5 9 * Wrong setting between master and
slave Outdoor unit
6 0 * Inverter PCB EEPROM Error of
Master Outdoor Unit
6 2 * Master Outdoor Unit Inverter
Heatsink High Temperature
6 5 * Master Outdoor Unit Inverter
Heatsink Temperature Sensor Fault
7 1 * Inverter CT Sensor Error of Master
Outdoor Unit
8 6 * Master Outdoor Unit Main PCB
EEPROM Error
1 0 4 * Communication Error Between Master
Outdoor Unit and Other Outdoor Unit
1 1 3 * Outdoor Unit Liquid pipe Temperature
Sensor Error
1 1 5 * Outdoor Unit Subcooling Outlet
Temperature Sensor Error
1 1 6 * Outdoor Unit Oil Level Sensor Error
1 4 5 * Outdoor unit Main Board - External
Board communication Error
1 5 0 * Outdoor Unit Discharge Superheat
not satisfied
1 5 1 * Failure of operation mode conversion
at Outdoor Unit
1 8 0 * Plate type heat exchanger freeze
prevention
1 8 1 * Water outlet temperature sensor error
1 8 2 * Outdoor unit External Board Main-Sub
Micom communication Error
1 8 7 * Hydro - Kit P,HEX bursting error
1 8 8 * Water inlet temperature sensor error
1 8 9 * Flow switch error
Title
- 101 -
Cause of Error
Master Outdoor Unit Suction Temperature
Sensor open or short
Master Outdoor Unit IPM Temperature Sensor
short/open
Omitting connection of Master outdoor unit
Excessive connection of indoor units compared
to capacity of Outdoor Unit
Failing to receive inverter signal at main PCB of
Master Outdoor Unit
Failing to receive indoor unit signal at main
PCB of Outdoor Unit.
Failing to receive signal main PCB at inverter
PCB of Master Outdoor Unit
When geothermal mode setting is different
(Fn 2 setting)
Access Error of Inverter PCB of Master Outdoor Unit
System is turned off by Master Outdoor Unit
Inverter Heatsink High Temperature
Master Outdoor Unit Inverter Heatsink
Temperature Sensor open or short
Inverter CT Sensor open or short of Master
Outdoor Unit
Communication Fail Between Master Outdoor Unit
Main MICOM and EEPROM or omitting EEPROM
Failing to receive Slave Unit signal at main
PCB of Master Outdoor Unit
Liquid pipe temperature sensor of Outdoor Unit
is open or short
Outdoor Unit Subcooling Outlet Temperature
Sensor Error
Oil Level Sensor of Outdoor Unit is open or short
Outdoor unit Main Board - External Board
communication Error
Outdoor Unit Compressor Discharge Superheat
not satisfied during 5 Min.
Failure of operation mode conversion at
Outdoor Unit
Plate type heat exchanger freeze prevention
error
Water outlet temperature sensor open or short
Outdoor Unit Main Board Main-Sub Micom
communication failed
Inlet water temperature is below 5 degree or water
temperature error during defrosting operation.
Water inlet temperature sensor open or short
Heat water not supplied or flow rate is insufficient
Copyright © 2020 LG Electronics. Inc.
All right reserved. Only for training and service purposes
Self-diagnosis function
Advertisement
Table of Contents
