Gree GMV6 DC Inverter VRF Units Service Manual
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2.100 "J9" Low Pressure Ratio Protection
Fault display:
main board of outdoor unit, wired controller of indoor unit and receiver of indoor unit
display
Fault diagnosis:
When the ratio between the system high pressure and the low pressure during operation detected
by the pressure sensor is smaller than 1.8, the unit will stop running to ensure safe operation.
Possible causes:
■ The pressure sensor is abnormal;
■ The ambient temperature where the unit operates exceeds the limit.
Troubleshooting:
"J9" Over Low Pressure
Ratio Protection
Replace the pressure
sensor
Yes
Whether the air return
temperature of the unit exceeds the limit during
operation (requirements in cooling mode: outdoor ambient
temperature -5°C to +50°C, indoor ambient temperature 16°C to 32°C;
requirements in heating mode: outdoor ambient temperature
-20°C to +24°C, indoor ambient
temperature 16°C to 30°C)?
Whether the high and low
pressure sensors are operating properly
(based on the Table of Characteristics
of Pressure Sensors)?
No
This case is normal as it is
subject to ambient
temperature
Yes
2.101 "L0" Indoor Unit Fault (Unified)
Fault display:
wired controller of indoor unit displays
Applicable models:
all indoor units
Possible causes:
■ The indoor unit is faulty.
Troubleshooting:
When multiple indoor units are installed in the same place, you can use the function of "indoor unit
engineering SN query and fault indoor unit identification" to fast locate the faulty indoor unit or the
corresponding indoor unit controlled by a wired controller. The detailed operations are as follows:
"C01" indoor unit engineering SN and fault query:
Summary of Contents for GMV6 Series
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