Gree GMV6 DC Inverter VRF Units Service Manual
26
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.
—
Debugging code
Progress code
Status code
Meaning
Progress
LED1
LED2
LED3
Code
Display
status
Code
Display
status
Code
Display
status
09_refrigerant
judgement before
startup
db
ON
09
ON
U4
ON
The refrigerant in the system is
insufficient. Please charge
refrigerant until the fault
disappears.
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.
—
Debugging code
Progress code
Status code
Meaning
Progress
LED1
LED2
LED3
Code
Display
status
Code
Display
status
Code
Display
status
10_ status judgment of
main pipeline before
starting
db
ON
10
ON
ON
ON
Starting and operating.
If the unit has detected the abnormal status, the display is as below:
—
Debugging code
Progress code
Status code
Meaning
Progress
LED1
LED2
LED3
Code
Display
status
Code
Display
status
Code
Display
status
10_ status judgment of
main pipeline before
starting
db
ON
10
ON
U6
ON
Main pipeline is abnormal.
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.
—
Debugging code
Progress code
Status code
Meaning
Progress
LED1
LED2
LED3
Code
Display
status
Code
Display
status
Code
Display
status
10_ status judgment of
main pipeline before
starting
db
ON
10
ON
OC
ON
The main pipeline is turned on
normally.
Step 14:
Unit debugging step 11 is “reserved function”.
The main module display is as below. The unit automatically enters into the next step.
—
Debugging code
Progress code
Status code
Meaning
Progress
LED1
LED2
LED3
Code
Display
status
Code
Display
status
Code
Display
status
11_ reserved function
db
ON
11
ON
AE
ON
—
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.
Summary of Contents for GMV-1015WM/G-U
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