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MULTI V 5 Outdoor Unit Service Manual
Due to our policy of continuous product innovation, some specifications may change without notification.
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Error Code Description Details
1531
Master outdoor unit upper heat exchanger 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.
1532
Slave1 outdoor unit upper heat exchanger temperature
sensor error.
1533
Slave2 outdoor unit upper heat exchanger temperature
sensor error.
1541
Master outdoor unit lower heat exchanger temperature
sensor error.
1542
Slave1 outdoor unit lower heat exchanger temperature
sensor error.
1543
Slave2 outdoor unit lower heat exchanger temperature
sensor error.
1821
Communication error between master outdoor unit
external board main and sub MICOMs.
Master outdoor unit external board main to sub MICOMs
communication failure.
1822
Communication error between slave1 outdoor unit
external board main and sub MICOMs.
Slave1 outdoor unit external board main to sub MICOMs
communication failure.
1823
Communication error between slave2 outdoor unit
external board main and sub MICOMs.
Slave2 outdoor unit external board main to sub MICOMs
communication failure.
1871
Hydro kit P, HEX error (P equals prevents from freez-
ing).
• Inlet water temperature is <5°C (41°F). Raise error code –
Level 3 response.
• Water outlet temperature sensor is disconnected or shorted.
9DOXHVUHDGOHVVWKDQ&RUJUHDWHUWKDQ&OHVVWKDQ
)RUJUHDWHUWKDQ)
• Prevents HEX from bursting (from freezing) when operating.
Does not protect HEX if the glycol is inadequate, nor if the
hydro kit is off and not operating.
Outdoor unit compressor ramps up, and hydro kit operates. One
(1) minute later, pipe temperature at mid-temperature hot water
supply (inlet or outlet water) is <0°C (32°F), and mid-tempera-
WXUHKRWZDWHUVXSSO\LQOHWRURXWOHWZDWHULV&)IRU
ten (10) seconds.
1872
1873
1931
Excessive increase in master outdoor unit fan heatsink
temperature.
• System has shut off because outdoor unit fan heatsink tem-
perature is >203°F.
• 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.
1932
Excessive increase in slave1 outdoor unit fan heatsink
temperature.
1933
Excessive increase in slave2 outdoor unit fan heatsink
temperature.
1941
Master outdoor unit fan 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.
1942
Slave1 outdoor unit fan heatsink temperature
sensor error.
1943
Slave2 outdoor unit fan heatsink temperature
sensor error.
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
Table 76: Error Codes, continued.
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