GMV5 D.C INVERTER MULTI VRF SERVICE MANUAL
137
07_Component
detection for IDU
XXXX/Corre
sponding
fault code
The system detects
component failure of
IDU.
"XXXX" indicates the project number of the faulty IDU. The corresponding fault code is displayed
after three seconds. For example, if a d5 fault occurs on IDU 100, LED3 will circularly display "01", "00"
(two seconds later), and "d5" (two seconds later).
For details about the above troubleshooting method, refer to the "Troubleshooting Method" part.
Step 12: Unit commissioning step 08 is compressor preheating confirmation.
If it is detected that the compressor preheating period is more than eight hours, the main board is
displayed as follows and the unit automatically enters the next step.
08_Compressor
preheating
confirmation
The system detects
that the compressor preheating
period is more than eight hours
and automatically enters the
next step.
If it is detected that the compressor preheating period is less than eight hours, an exception is
prompted and the main board is displayed as follows.
08_Compres
sor
preheating
confirmation
The system gives a prompt if
the compressor preheating
period is less than eight
hours.
Before starting commissioning, the outdoor unit must be power-on for more than 8 hours.
Otherwise, compressor may be damaged.
During daily operation, please keep the outdoor unit power-on at any time.
If unit is power-off for more than 24 hours, it must be preheated for at least 8 hours before operation.
Step 13: Unit commissioning step 09 is pre-startup refrigerant confirmation.
If the refrigerant volume meets the system startup requirements, the main board is displayed as
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