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When there is no failure, if the starting condition can not be met, digital tube on master unit will display stand-by
code:
Stand-by state of capacity
555.0
overmatch
Stand-by state of 26°C of
555.1
heating mode
Stand-by state of
555.2
low pressure (lack of
refrigerant)
Stand-by state of 54°C of
555.3
cooling mode
VB device failure code list
Failure
Failure code definition
code
5
VB device EEPROM date failure
Communication between VB
6
device and outdoor failure
Communication between VB
7
device and indoor failure
9
VB device repeated address
20
Outdoor corresponding failure
When capacity is over 135% or lower than 50%, the system
is standby.
When it is in heating mode with ambient temp. over 26°C,the
system is standby.
When the unit starts in cooling Ps<0.23MPa or heating
Ps<0.12MPa, the system is standby.
For high ambient models, the unit can not open if ambient
temp. over 54°C in cooling mode, and the digital tube
display: "555.3"
Judgment method
No communication with the outdoor unit for
continuous 120 seconds
When detecting the connected indoor units, the
indoor unit quantity is zero.
147
Resumable.
Remarks
Unresumable
Resumable
Resumable
Resumable
Resumable
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