Gree GMV5E Series - Page 175

GREE GMV5E DC INVERTER VRF UNITS SERVICE MANUAL
171
Troubleshooting:
2.2.4.53 “db” Project debugging
Error display:
ODU mainboard, IDU wired controller and IDU receive light board will
display
Error judgment condition and method:
This is a status code of project debugging, not a error code. When IDU or ODU displays this code, it
means the unit is under debugging status and the IDU cannot be operated.
Troubleshooting: ——
Possible reason：——
2.2.4.54 “E1” High pressure protection
Error display:
ODU mainboard, IDU wired controller and IDU receive light board will
display
Error judgment condition and method:
Judge through high pressure sensor detecting system real-time high pressure or action of high
pressure switch. If the sensor detects that high pressure is bigger than 65
°C
or high pressure switch is
cut off, it is judged that high pressure is too high and the system stops operation for protection.
Possible reason:
■Cut-off valve of ODU is not fully opened;
■High pressure sensor is abnormal;
■High pressure switch is abnormal;
■Outdoor or indoor fan is not working properly;
■IDU filter or air duct is blocked (heating mode);
■Ambient temperature is too high;
■Refrigerant charging amount is too much;
■System pipeline is blocked;