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Table 7.4 Installation and commissioning codes
Check code
U11
Outdoor unit type setting error
U12
Capacity setting error
Wrong type of indoor units combined
U21
The indoor units of previous generations were connected
or repeated indoor units address
Wrong type of indoor units combined
U22
Only hydraulic module is connected in the system.
Wrong type of indoor units combined
U23
Common indoor units and constant temperature and humidity control DX AHU are in
the system
Wrong type of indoor units combined
U24
Common indoor unit and reheating type fresh air processing DX AHU a re in the
system.
Wrong type of indoor units combined
The system connects two or more special units.
U25
The special units are fresh air processing unit, DX AHU through AHU Kit, constant
temperature and humidity control DX AHU, reheating type fresh air processing DX
AHU, hydraulic module.
U26
Mismatch between indoor units and outdoor units
U31
Test run failed or test run not executed
U32
Outdoor temperature exceeds the allowable operating range
U33
Indoor temperature exceeds the allowable operating range
U34
Outdoor and indoor temperature exceeds the allowable operating range
U35
Liquid side stop valve is closed
U37
Gas side stop valve is closed
U38
No address
The refrigerant piping and communication wiring are improperly connected to the
U3A
outdoor units.
The installation environment causes poor heat absorption and dissipation of the
U3b
outdoor unit
Auto mode error
U3C
Only activated in Changeover priority mode
U41
Common indoor units exceed the allowable connection combination ratio
U42
Fresh Air Processing indoor unit exceeds the allowable combination ratio
U43
DX AHU (discharge air temperature control) exceeds the allowable combination ratio
U44
DX AHU (return air temperature control) exceeds the allowable combination ratio
Constant temperature and humidity DX AHU (with discharge air temperature control)
U45
exceeds the allowable combination ratio
Reheat type fresh air processing DX AHU (with discharge air temperature control)
U46
exceeds the allowable combination ratio
U48
The total capacity of the indoor units exceeds the allowable combination ratio
Wrong setting
U54
The heat pump model is set with one or more MS units
Description
Manual reset
YES
YES
YES
YES
YES
YES
YES
YES
YES
YES
YES
YES
YES
YES
YES
YES
YES
NO
YES
YES
YES
YES
YES
YES
YES
YES
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