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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
Outdoor Unit
4 2 1 Master outdoor unit low pressure 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.
4 2 2 Slave1 outdoor unit low pressure sensor error.
4 2 3 Slave2 outdoor unit low pressure sensor error.
4 3 1 Master outdoor unit high pressure sensor error.
4 3 2 Slave1 outdoor unit high pressure sensor error.
4 3 3 Slave2 outdoor unit high pressure sensor error.
4 4 1 Master outdoor unit ambient temperature sensor error.
• Check the connection on the outdoor unit PCB.
• Thermistor shorted or opened.
4 4 2 Slave1 outdoor unit ambient temperature sensor error.
4 4 3 Slave2 outdoor unit ambient temperature sensor error.
451
Master outdoor unit heat exchanger pipe temperature
sensor.
452
Slave1 outdoor unit heat exchanger pipe temperature
sensor.
453
Slave2 outdoor unit heat exchanger pipe temperature
sensor.
4 6 1 Master outdoor unit suction pipe temperature sensor error. • Check the connection on the outdoor unit PCB.
• Thermistor shorted or opened.
• Check suction sensor in cooling mode; check hot gas sensor
located near the heat exchanger in heating mode.
4 6 2 Slave1 outdoor unit suction pipe temperature sensor error.
4 6 3 Slave2 outdoor unit suction pipe temperature sensor error.
471
Master outdoor unit inverter compressor2 discharge
temperature sensor error.
• Error can also occur if the system is operating in cooling at
extremely low temperatures with no low ambient kit.
• Check the connection on the outdoor unit PCB.
• Thermistor shorted or opened.
• Defective outdoor unit PCB.
472
Slave1 outdoor unit inverter compressor2 discharge
temperature sensor error.
473
Slave2 outdoor unit inverter compressor2 discharge
temperature sensor error.
4 9 1 Master outdoor unit IPM temperature sensor error.
• Check the connection on the outdoor unit PCB.
• Thermistor shorted or opened.
4 9 2 Slave1 outdoor unit IPM temperature sensor error.
4 9 3 Slave2 outdoor unit IPM temperature sensor error.
5 0 1 Master outdoor unit loss of phase.
One or more of R(L1), S(L2), T(L3) input power line connections
is / are missing for the master outdoor unit.
5 0 2 Slave1 outdoor unit loss of phase.
One or more of R(L1), S(L2), T(L3) input power line connections
is / are missing for the slave1 outdoor unit.
5 0 3 Slave2 outdoor unit loss of phase.
One or more of R(L1), S(L2), T(L3) input power line connections
is / are missing for the slave2 outdoor unit.
5 1 1 Combination ratio is out of range.
The total of the nominal indoor unit capacity is less than 50% or
more than 130% of the nominal outdoor unit capacity.
512
Total indoor unit capacity exceeds allowable heat
recovery unit branch capacity. (Heat Recovery Systems
only.)
Value of total indoor unit capacity exceeds allowable heat recov-
ery unit branch capacity specifications. After auto-pipe detection
is complete, wait 5 minutes, then verify connected capacity.
System will display error if:
• The heat recovery unit port addresses are all unique, then >54
Mbh single indoor unit connected; >54 Mbh total of multiple
IDUs connected.
• If 2 heat recovery unit port addresses are the same and the
ports are twinned; >108 Mbh total of multiple indoor units are
connected.
• If 3 heat recovery unit port addresses are the same and the
ports are all connected, >162 Mbh total of multiple indoor units
connected.
• If the total connected indoor unit nominal capacity exceeds 192
Mbh for a single heat recovery unit.
Table 72: 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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