Gree GMVVQ1015WM/C-X, Service Manual

Page: 181 / 433

Gree GMV6 HR DC Inverter VRF Units Service Manual
179
2.116 "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 Pressu re
Ratio P rote ction
Replace th e p ressur e
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 h igh and low
pressure sensors are op erating prope rly
(based on the Tab le of Characteristics
of P ressur e S ensors)?
No
This case is normal as i t is
subject to ambient
temperature
Yes