Gree GMVVQ224WM/C-X Owner's Manual page 60

(2) When starting up the debugging, the system automatically selects the operating mode
according to the current ambient temperature.
(3) When debugging, the front panel of the outdoor unit must be completely closed, otherwise it
will affect the accuracy of debugging (as shown in the Fig. as below).
(4) Display instruction for each stage progress at the time of debugging:
Debugging code Progress code
—
LED1
Progress
Display
Code
status
db
db
01_ set up
db
master unit
db
db
02_ allocate
addresses
db
Instruction for each stage progress at the time of debugging
LED2
Display
Code
status
ON 01 ON
ON 01 ON
ON 01 ON
ON 01 ON
ON 02 ON
ON 02 ON
GMV Heat Recovery DC Inverter VRF
Fig.4.2.1
Fig.4.2.2
Status code
LED3
Display
Code
status
A0 ON Undebugged status.
The system hasn't set master module.
CC ON
It needs to reset it.
The system has set more than 2
CF ON
master modules. It needs to reset it.
Master module setting is succeeded. It
OC ON will automatically enter into the next
step.
The system is conducting the address
Ad Flash
assignment.
Address assignment is succeeded. It
OC ON will automatically enter into the next
step.
56
Meaning