Gree GMV-Y96WM/A-F(U) Owner's Manual page 50

Step 12: progress 08 is "Confirm preheated compressor"
If more than 8h of preheat time is detected, system will display as below and start next
progress.
——
progress
08_Confirm preheated
compressor
If less than 8h of preheat time is detected, system will give error alarm and display as below.
Then press SW7 confirmation button to skip the wait time and start next progress. But this will cause
force start of the compressor, which may damage the compressor.
——
progress
08_Confirm preheated
compressor
Step 13: progress 09 is "Refrigerant judgments before startup"
If the refrigerant quantity inside the system meets the requirement of operation startup,
system will display as below and start next progress.
——
progress
09_Refrigerant judgments
before startup
If there's no or not enough refrigerant in the system to meet the requirement of operation
startup, system will display U4 "refrigerant shortage protection" and fails to start next progress. Then
check if there's any leakage or add refrigerant inside until error eliminated.
——
Debugging code
LED1
progress
Code
09_Refrigerant
judgments before db
startup
Debugging code Progress code
LED1
Display
Code code
status
db Light 08
Debugging code Progress code
LED1
Display
Code code
status
db Light 08
Debugging code Progress code
LED1
Display
Code code
status
db Light 09
Progress code
LED2
Display Display
code
status status
Light 09 Light
Status code
LED2 LED3
Display
Code
status
Light OC
Status code
LED2 LED3
Display
Code
status
Light UO
Status code
LED2 LED3
Display
Code
status
Light OC
Status code
LED3
Display
Code
status
System refrigerant is not enough.
O4 Light System downtime equilibrium pressure is
lower than 0.3MPa(4-2/5psig).
46
Photovoltaic Multi VRF
Meaning
Display
status
Preheat time for compressor
Light
is 8h. Start next progress.
Meaning
Display
status
Preheat time for compressor
Light
is less than 8h.
Meaning
Display
status
System refrigerant is normal.
Light
Start next progress.
Meaning