Gree GMV-224WM/B-X Owner's Manual page 47

5.2.2.2 Debugging operation mode
GMV5 multi VRF system has two debugging modes: one is direct operation on main board of
outdoor units while the other is PC operation via special software. In PC software debugging, indoor/
outdoor parameters can be displayed and historical data can be recorded and inquired. (Operation
details can be found in relevant instruction manuals)
(1) Debugging through operation on main board of outdoor units
In this debugging mode, following debugging functions are included on the main board:
Step 1: front panel of the outdoor units must be fully closed. Open the debugging window of each
basic module;
Step 2: disconnect power for outdoor units. According to design requirements of external static
pressure, set up corresponding static pressure mode for the units. Setting methods can be seen in
Outdoor Fan Static Pressure Setup SA6_ESP_S;
Step 3: disconnect power for outdoor units and set one module as a master unit. Setting methods
can be seen in Master Unit Setup SA8_MASTER_S;
Step 4: Connect power for all indoor units. Make sure all IDUs are power on. Then all outdoor
modules will display "Debugging not enabled";
Step 5: Find the module with "01" module address to be the master module. Hold SW7 button on
the master module for at least 5s to enable debugging;
Step 6: Wait. Unit will then start progress 01 and 02; in progress 01, if master unit is not correctly
set, progress 01 will show the following errors:
Debugging Code
LED1
Progress
Display
Code
status
db light
01_01 Set
up master db light
unit:
db light
According to the above errors, reset the master unit as instructed in Master Unit Setup SA8_
MASTER_S. After reset is finished, start debugging again.
In progress 02, if master IDU is not detected, then progress 02 will show the following errors:
LED1
Function code Display mode
db
At this time, all buttons are ineffective. Set master IDU in 1min via debugging software. If master
IDU is not set in 1min, system will set up a master IDU randomly. After that, system will start next
progress.
Step 7: in progress 03, the quantity of modules needs to be confirmed manually. Main board of
each module will display:
Progress
03_Quantity of
modules
If the quantity displayed is the same with actual quantity, then press SW7 confirmation button on
the master unit to confirm it. Unit will start next progress:
Progress Code
LED2
Display
Code
status
01 light
01 light
01 light
Current progress
light 02
Debugging code
LED1
Code Display status
db light
Debugging code
D.C. Inverter Multi-variable Modular
Status Code
LED3
Display
Code
status
System doesn't have master unit. Reset master
CC light
unit.
More than 2 master units are set. Reset master
CF light
unit.
Master unit is successfully set. Start next
OC light
progress.
LED2
Display mode
light
Progress code
LED2
Code Display status
03 light
Progress code
44
Meaning
LED3
Current status Display mode
L7 blink
Status code
LED3
Code Display status
Quantity of
modules
Status code
blink