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Outdoor Unit Inverter Compressor
3
2
1
High Discharge Temperature
High Pressure of Outdoor Unit
3
4
1
Low Pressure of Outdoor Unit
3
5
1
3
6
1
Low pressure ratio
PFC Transmission error :
3
9
1
Inv. Micom ↔ Convertor Micom
Outdoor Unit Inverter Compressor
4
0
1
CT Sensor Fault
Outdoor Unit Inverter Compressor
4
1
1
Discharge Temperature Sensor Fault
Outdoor Unit Low Pressure
4
2
1
Sensor Fault
Outdoor Unit High Pressure
4
3
1
Sensor Fault
Outdoor Unit Air Temperature
4
4
1
Sensor Fault
Outdoor unit Heat Exchanger
4
5
1
Temperature Sensor Fault
Outdoor Unit Suction Temperature
4
6
1
Sensor Fault
Omitting connection of R power of
Outdoor unit ¡ CH 50
❈ Note
- Omitting connection of S power of
5
0
1
Outdoor unit ¡ CH 23
- Omitting connection of T power of
Outdoor units ¡ Main PCB power OFF
Excessive capacity of indoor units
5
1
1
Transmission error : inverter PCB
5
2
1
¡ Main PCB
Transmission error : indoor unit ¡
5
3
1
main PCB of outdoor unit
Reverse connection of R, S, T
5
4
1
power of Outdoor unit
6
0
1
Inverter PCB EEPROM error
6
2
1
Heat sink temperature high error
Heat sink temperature sensor
6
5
1
error
6
7
1
Fan lock
Instant Over Current(Peak) of
7
3
1
Outdoor Unit PFC
Outdoor Unit Main PCB EEPROM
8
6
1
Error
Outdoor Unit Liquid pipe
1 1 3
1
Temperature Sensor Error
Outdoor Unit Subcooling Inlet
1 1 4
1
Temperature Sensor Error
Outdoor Unit Subcooling Outlet
1 1 5
1
Temperature Sensor Error
Failure of operation mode
1 5 1
1
conversion at Outdoor Unit
Title
System is turned off by outdoor unit Inverter
Compressor High Discharge Temperature
System is turned off by excessive increase of high
pressure of outdoor unit
System is turned off by excessive decrease of low
pressure of outdoor unit
Pressure ratio is under limit
Failing to transmission between inverter Micom and
converter Micom
Outdoor Unit Inverter Compressor CT Sensor open or
short
Outdoor Unit Inverter Compressor Discharge
Temperature Sensor open or short
Outdoor Unit Low Pressure Sensor open or short
Outdoor Unit High Pressure Sensor open or short
Outdoor Unit Air Temperature Sensor open or short
Outdoor Unit Heat Exchanger Temperature Sensor
open or short
Outdoor Unit Suction Temperature Sensor open or
short
Omitting connection of Outdoor unit
Excessive connection of indoor units compared to
capacity of outdoor unit
Failing to receive inverter signal at main PCB of
Outdoor Unit
Failing to receive indoor unit signal at main PCB of
outdoor Unit.
Reverse connection or omitting connection of R, S, T
power of Outdoor unit
Check EEPROM checksum error when resetting power
When Heat sink temperature is above setting value
When the temperature sensor value is too high
Fan operation fail at starting or during operation
Instant Over Current(Peak) of Outdoor Unit PFC
Communication Fail Between Outdoor Unit Fan
MICOM and EEPROM or omitting EEPROM
Liquid pipe temperature sensor of outdoor unit is open
or short
Outdoor Unit Subcooling Inlet Temperature Sensor
open or short
Outdoor Unit Subcooling Outlet Temperature Sensor
open or short
Pressure unbalance between outdoor units
Test Run
Cause of Error
Installation Manual 59
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