DC Inverter Multi VRF System
28
Description of each stage of debugging progress
Code meaning and operation
method
Progress
Code
Code
Code
db On 06 On OC On
System detects no error on outdoor
component. 10s later, next step
07_ Detect
indoor
components
db On 07 On
XXXX/
Error
code
On
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 show circularly
00,01,d5,d6,07,92,d6,d7 every 2s.
After errors are eliminated, system
will start next step automatically. If
power is off during troubleshooting,
then restart debugging from
progress 01 after power is on.
db On 07 On OC On
No error on components of IDU. 2s
08_ Confirm
preheated
compressor
db On 08 On UO On
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
db On 08 On OC On
Compressor has been preheated for
8 hours. 2s later, next step starts.
09_ Refrigerant
judgments
before startup
db On 09 On U4 On
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 pipeline.
Solve the leakage problem and
complement refrigerant into the unit.
Then connect power and restart
debugging from progress 01 (Note:
Before re-charging refrigerant, unit
must be power off in case system
starts progress 10 automatically).
db On 09 On OC On
Refrigerant is normal and unit will
display as in the left for 2s. Then
10_ Status
judgments of
outdoor valves
before startup
db On 10 On ON On
Valves of ODU are being inspected.
Compressor will start operation for
2min or so and then stop. The
opening and closing status of
outdoor valves are as below.
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