Gree GMV6 DC Inverter VRF Units Service Manual
2.99 "J8" High 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 exceeds 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:
"J8" Over High Pressure
Ratio Prote ction
Replace th e p ressure
sensor
Yes
Whether the air return
te mperature of the unit excee ds the limit during
operation (requirements in cooling mode: outdoor ambient
te mperature -5°C to +50°C, indoor ambient temp erature 16° C to 32°C;
requirements in heating mode: outdoor ambient temperature
-20°C to +24°C, indoor ambient
te mperature 16°C to 30°C)?
Whether th e high and low
pressure sensors are op erating properly
(based on the Table of Characteristics
of P ressure Sensors)?
No
This case is normal as i t is
subject to ambient
temperature
Yes
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