131
Error Codes
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Error Code Description Details
Outdoor Unit
521
Communication error between master outdoor unit main
PCB and inverter PCB.
• Communication error between main PCB and inverter PCB.
• Check connections at both sockets.
• Inspect interconnecting cable for wear.
522
Communication error between slave1 outdoor unit main
PCB and inverter PCB.
523
Communication error between slave2 outdoor unit main
PCB and inverter PCB.
531
Communication error between master outdoor unit main
PCB and indoor unit(s) PCB.
• Check if outdoor unit to indoor unit(s) communications cable
disconnected or shorted.
• Check A terminals are connected to indoor unit A(3) (5 on 3 x
3 cassette) terminals; B(4) (6 on 3 x 3 cassette) terminals.
532
Communication error between slave1 outdoor unit main
PCB and indoor unit(s) PCB.
533
Communication error between slave2 outdoor unit main
PCB and indoor unit(s) PCB.
571
Master outdoor unit main PCB and inverter PCB
communication error.
Master outdoor unit inverter PCB is not receiving signal from
main PCB.
572
Slave1 outdoor unit main PCB and inverter PCB
communication error.
Slave1 outdoor unit inverter PCB is not receiving signal from
main PCB.
573
Slave2 outdoor unit main PCB and inverter PCB
communication error.
Slave2 outdoor unit inverter PCB is not receiving signal from
main PCB.
6 0 1 Master outdoor unit inverter PCB EEPROM error. • Verify the EEPROM is present and in the socket correctly.
• Check if all pins are in and are not bent.
• Check if notch in the chip lines up with the arrow on the
socket.
6 0 2 Slave1 outdoor unit inverter PCB EEPROM error.
6 0 3 Slave2 outdoor unit inverter PCB EEPROM error.
621
High temperature at the master outdoor unit inverter
heatsink.
System shut off because of high temperatures at the master
outdoor unit inverter heatsink.
622
High temperature at the slave1 outdoor unit inverter
heatsink.
System shut off because of high temperatures at the slave1
outdoor unit inverter heatsink.
623
High temperature at the slave2 outdoor unit inverter
heatsink.
System shut off because of high temperatures at the slave2
outdoor unit inverter heatsink.
651
Master outdoor unit inverter heatsink temperature
sensor error.
• Check the connection on the outdoor unit PCB.
• Thermistor shorted or opened.
• Check for 12 V DC between 12 V and GND (red to black) for
5 V DC.
• Check the Signal to GND (white to black) and use correct chart
from Troubleshooting section to compare with actual system
temperature.
652
Slave1 outdoor unit inverter heatsink temperature
sensor error.
653
Slave2 outdoor unit inverter heatsink temperature
sensor error.
6 7 1 Master outdoor unit fan has locked up.
No airflow.6 7 2 Slave1 outdoor unit fan has locked up.
6 7 3 Slave2 outdoor unit fan has locked up
7 1 1 Master outdoor unit inverter CT sensor error. Master outdoor unit is restricted.
7 1 2 Slave1 outdoor unit inverter CT sensor error. Slave1 outdoor unit is restricted.
7 1 3 Slave2 outdoor unit inverter CT sensor error. Slave2 outdoor unit is restricted.
7 5 1 Master outdoor unit fan CT sensor error.
Master outdoor unit fan current detection (CT) sensor discon-
nected or shorted.
7 5 2 Slave1 outdoor unit fan CT sensor error.
Slave1 outdoor unit fan current detection (CT) sensor discon-
nected or shorted.
7 5 3 Slave2 outdoor unit fan CT sensor error.
Slave2 outdoor unit fan current detection (CT) sensor discon-
nected or shorted.
Table 73: Error Codes, continued.
ERROR CODE TABLES
Please refer to the Safety Precautions on pages 4-7 for more detail to prevent injury or death regarding the operation and service
troubleshooting of the Multi V product.
WARNING
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