DC Inverter Multi VRF System User Manual
——
Debugging code
Progress
Code
07_ Detect
indoor
components
08_ Confirm
preheated
compressor
09_
Refrigerant
judgments
before
startup
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Description of each stage of debugging progress
Progress code
LED1
LED2
Display
Display
Code
status
db
On
07
db
On
07
db
On
08
db
On
08
db
On
09
db
On
09
Status code
LED3
Display
Code
status
status
XXXX
/
On
On
Error
code
On
OC
On
On
UO
On
On
OC
On
On
U4
On
On
OC
On
29
Code meaning and operation
method
System detects error on indoor
components.
XXXX means the
project code of IDU with error. 3s
later, related error code will be
showed. For instance, if no.1 IDU
has d6 and d7 errors, then the
LED3
digital
tube
will
circularly
00,01,d5,d6,07,92,d6,d7
every
2s.
After
errors
eliminated, system will start next
step automatically. If power is off
during troubleshooting, then restart
debugging from progress 01 after
power is on.
No error on components of IDU. 2s
later, next step starts.
Preheat time for compressor is less
than 8 hours. Display will be as in
the left until the preheat time
reaches 8 hours. Press main
board's SW7 button to confirm
manually that the preheat time has
reached 8 hours. Then start next
step. (Note: Compressor may get
damaged if it is started without 8
hours of preheat time)
Compressor has been preheated
for 8 hours. 2s later, next step
starts.
System is lack of refrigerant and
display will be as in the left. Please
cut off power of IDU and ODU and
check if there is leakage on
Solve
the
pipeline.
problem
and
complement
refrigerant into the
unit. Then
connect
power
and
debugging from progress 01. (Note:
Before re-charging refrigerant, unit
must be power off in case system
starts progress 10 automatically.)
Refrigerant is normal and unit will
display as in the left for 2s. Then
next step starts.
show
are
leakage
restart