GREE GMV5E DC INVERTER VRF UNITS SERVICE MANUAL
210
2.2.4.96
“J8” System high pressure ratio protection
Error display:
ODU mainboard, IDU wired controller and IDU receive light board will
display
Error judgment condition and method:
Check the system high pressure and low pressure through pressure sensor. When the ratio
between system high pressure and low pressure is bigger than 8 after starting operation, the unit will
stop for protection.
Possible reason
：
■Pressure sensor is abnormal;
■Ambient temperature exceeds the requirement;
Troubleshooting:
2.2.4.97
“J9” System low pressure ratio protection
Error display:
ODU mainboard, IDU wired controller and IDU receive light board will
display
Error judgment condition and method:
Check the system high pressure and low pressure through pressure sensor. When the ratio
between system high pressure and low pressure is smaller than 1.8 after starting operation, the unit will
stop for protection.
Possible reason
：
■Pressure sensor is abnormal;
■Ambient temperature exceeds the requirement;
