Gree GMV-224WM/G-X Owner's Manual page 62

GMV DC Inverter VRF
If there is no refrigerant in the system or the amount of refrigerant does not meet the requirements
for starting operation, the unit will display U4 "Refrigerant-lacking protection", as shown below. The
unit will enter into the next step. At this time, it is necessary to check whether there is a leak or charge
some refrigerant until the abnormality is eliminated.
—
Progress
09_refrigerant judge
before start up
Step 13: Unit debugging step 10 is "status judgment of main pipeline before starting".
If the main module displays as below, it indicates the unit is starting the operation for judgment.
—
Progress
10_ status judgment of
main pipeline before
starting
If the unit has detected the abnormal status, the display is as below:
—
Progress
10_ status judgment of
main pipeline before
starting
At this time, it is necessary to check whether the gas valve and the liquid valve are completely
open or whether the main pipeline is blocked. Once inspection is completed, you can return to the
previous step by pressing SW4 button to re-enter the judgment.
If inspection valve of the unit is normal, the display is as below. The unit will automatically enter
into the next step.
—
Progress
10_ status judgment of
main pipeline before
starting
Step 14: Unit debugging step 11 is "reserved function".
The main module display is as below. The unit automatically enters into the next step.
—
Progress
11_ reserved function
Step 15: Unit debugging step 12 is "reserved function".
The master module display is as below. Then the unit automatically enters into the next step.
Debugging code Progress code
LED1
Display
Code Code
status
db ON 09
Debugging code Progress code
LED1
Display
Code Code
status
db ON 10
Debugging code Progress code
LED1
Display
Code Code
status
db ON 10
Debugging code Progress code
LED1
Display
Code Code
status
db ON 10
Debugging code Progress code
LED1
Display
Code Code
status
db ON 11
Status code
LED2 LED3
Display Display
Code
status status
ON U4 ON
Status code
LED2 LED3
Display Cod Display
status e status
ON ON ON
Status code
LED2 LED3
Display Cod Display
status e status
ON U6 ON
Status code
LED2 LED3
Display Cod Display
status e status
ON OC ON
Status code
LED2 LED3
Display Cod Display
status e status
ON AE ON
58
Meaning
The refrigerant in the system is
insufficient. Please charge
refrigerant until the fault
disappears.
Meaning
Starting and operating.
Meaning
Main pipeline is abnormal.
Meaning
The main pipeline is turned on
normally.
Meaning
—