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Master outside unit inverter PCB phase imbal-
7 4 1
ance
Slave1 outside unit inverter PCB phase imbal-
7 4 2
ance
Slave2 outside unit inverter PCB phase imbal-
7 4 3
ance
Master outside unit master PCB EEPROM
8 6 1
error
Slave1 outside unit master PCB EEPROM
8 6 2
error
Slave2 outside unit master PCB EEPROM
8 6 3
error
Master PFC PCB EEPROM error
8 8 1
Slave1 PFC PCB EEPROM error
8 8 2
Slave2 PFC PCB EEPROM error
8 8 3
Master Communication Error Between Master
1 0 4 1
Outdoor Unit and Other Outdoor Unit
Slave1 Communication Error Between Master
1 0 4 2
Outdoor Unit and Other Outdoor Unit
Slave2 Communication Error Between Master
1 0 4 3
Outdoor Unit and Other Outdoor Unit
Master Outdoor Unit Liquid pipe Temperature
1 1 3 1
Sensor Error
Slave1 Outdoor Unit Liquid pipe Temperature
1 1 3 2
Sensor Error
Slave2 Outdoor Unit Liquid pipe Temperature
1 1 3 3
Sensor Error
Master Outdoor Unit Subcooling Inlet
1 1 4 1
Temperature Sensor Error
Slave1 Outdoor Unit Subcooling Inlet
1 1 4 2
Temperature Sensor Error
Slave2 Outdoor Unit Subcooling Inlet
1 1 4 3
Temperature Sensor Error
Master outside unit over-cooling outlet temper-
1 1 5 1
ature sensor error
Slave1 outside unit over-cooling outlet temper-
1 1 5 2
ature sensor error
Slave2 outside unit over-cooling outlet temper-
1 1 5 3
ature sensor error
1 5 1 - Outside unit 4 way valve switch failure
Master outside unit static speed compressor
1 7 3 1
error
Slave1 outside unit static speed compressor
1 7 3 2
error
Slave2 outside unit static speed compressor
1 7 3 3
error
1 8 0 - Plate type heat exchanger freeze prevention
1 8 1 - Water temperature sensor error
1 8 2 - Communication error between MICOMs
n Refer to the troubleshooting guide of service technical manual for each error.
Error item
When the master outside unit inverter PCB input current is different
When the slave1 outside unit inverter PCB input current is different
When the slave2 outside unit inverter PCB input current is different
Communication error between master outside unit master MICOM and
EEPROM or EEPROM missing
Communication error between slave1 outside unit master MICOM and
EEPROM or EEPROM missing
Communication error between slave2 outside unit master MICOM and
EEPROM or EEPROM missing
Master Communication error between master outside unit master PFC
and EEPROM or EEPROM missing
Slave1 Communication error between master outside unit master PFC
and EEPROM or EEPROM missing
Slave2 Communication error between master outside unit master PFC
and EEPROM or EEPROM missing
Master Failing to receive Slave Unit signal at main PCB of Master
Outdoor Unit
Slave1 Failing to receive Slave Unit signal at main PCB of Master
Outdoor Unit
Slave2 Failing to receive Slave Unit signal at main PCB of Master
Outdoor Unit
Master Liquid pipe temperature sensor of Master Outdoor Unit is open
or short
Slave1 Liquid pipe temperature sensor of Master Outdoor Unit is open
or short
Slave2 Liquid pipe temperature sensor of Master Outdoor Unit is open
or short
Master Outdoor Unit Subcooling Inlet Temperature Sensor open or
short
Slave1 Outdoor Unit Subcooling Inlet Temperature Sensor open or
short
Slave2 Outdoor Unit Subcooling Inlet Temperature Sensor open or
short
Master outside unit over-cooling outlet temperature sensor disconnec-
tion or short circuit
Slave1 outside unit over-cooling outlet temperature sensor disconnec-
tion or short circuit
Slave2 outside unit over-cooling outlet temperature sensor disconnec-
tion or short circuit
Outside unit 4 way valve switch error
Master outside unit static speed compressor burn, locking and over-
current
Slave1 outside unit static speed compressor burn, locking and over-
current
Slave2 outside unit static speed compressor burn, locking and over-
current
Plate type heat exchanger freeze prevention error
Water temperature sensor open/short
Communication error between main MICOM and sub MICOM
Test Run
Root cause of error
Installation Manual 75
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