Gree Ultra Heat GMV Multi VRF Series Owner's Manual page 54

Ultra Heat GMV Multi VRF_Heat Recovery Serial
can be seen in Master Unit Setup S7 of Technical service manual (Set master unit S7 as "00"; Set slave
unit S7 as "10").
Step 4: Connect power for all indoor units. Make sure all IDUs are power on. Then all outdoor
modules will display "A0".
Step 5: Find the module with "00" of S7 which is the master module. The main board shows:
Debugging code
Code
A0
Hold SW4 button on the master module for at least 6s to enable debugging. Then the main board
shows:
Debugging code
Code
A0
Press SW4 confirmation button on the master unit to confirm it. Unit will start debugging.
Step 6: Wait. Unit will then start progress 01.
If no error is detected, system will display as below and then start next progress.
——
progress
01_Set up master unit
If unit have some errors, progress 01 will show the following errors:
——
Debugging Code
Progress
Code
CC
01_Set up
CF
master unit
CJ
According to the above errors, reset the master unit (Set master unit S7 as "00"; Set slave unit S7 as
"10"), then start debugging again.
Step 7: Progress 02 is allocating addresses. If allocating addresses is done, then main board
shows:
——
Progress
LED1
Display status code
Light
LED1
Display status code
Blink
Debugging code
LED1
Code Display status
db Light
Progress Code
LED1 LED2
Display
Code
status
Light
Light
Light
Debugging code
LED1
Code Display status
Progress code
LED2
Display status
Progress code
LED2
Display status
Progress code
LED2
code Display status
01
Status Code
LED3
Display Display
Code
status status
Progress code
LED2
Code Display status
49
Status code
LED3
Code Display status
0 Light
Status code
LED3
Code Display status
Status code
Code
Light oC
Meaning
System doesn't have master unit.
Reset master unit.
More than 2 master units are set.
Reset master unit.
Address DIP switch code of system is
shocking.
Status code
Code
LED3
Display status
Light
LED3
Display status