Gree GMV6 DC Inverter VRF Units Service Manual
2.55 "dE" Indoor CO2 Sensor Fault (Reserved)
2.56 "db" Engineering Commissioning
Fault display: main board of outdoor unit, wired controller of indoor unit and receiver of indoor unit
display
Fault diagnosis:
This is a status code but not a fault code. It indicates that the unit is being commissioned and the
indoor unit is not operational.
Possible causes: --
Troubleshooting: --
2.57 "E1" Protection in Case of Too High Pressure
Fault display: main board of outdoor unit, wired controller of indoor unit and receiver of indoor unit
display
Fault diagnosis:
When the high pressure sensor detects that the temperature at the high pressure is greater than
65°C or the high pressure switch is disconnected, it indicates that the high pressure is too high, and the
unit will stop running to ensure safe operation.
Possible causes:
■ Check valve of the outdoor unit is closed;
■ Abnormal high pressure sensor;
■ The high pressure switch operates improperly;
■ Abnormal outdoor or indoor fans;
■ Clogging of indoor filter or air duct (heating mode);
■ The ambient temperature where the unit operates is too high;
■ Excessive refrigerant in the unit;
■ Clogging of unit pipes.
Troubleshooting:
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