Gree GMV6 DC Inverter VRF Units Service Manual
able to reset the unit normally, inspect other parts of the unit.
Step 4:
Check whether the refrigerant is added in accordance with the design requirements, as
excessive refrigerant may trigger system protection.
Solution:
Add refrigerant in accordance with the design requirements.
2.59 "E3" System Low Pressure Protection
Fault display: main board of outdoor unit, wired controller of indoor unit and receiver of indoor unit
display
Fault diagnosis:
The low pressure sensor detects the compressor's suction pressure. When the saturation
temperature corresponding to the low pressure is below -41°C, the unit stops to ensure safe operation.
Possible causes:
■ Check valve of the outdoor unit is closed;
■ Abnormal low pressure sensor;
■ Abnormal outdoor or indoor fans;
■ Clogging of indoor filter or air duct (cooling mode);
■ The ambient temperature where the unit operates is too low;
■ Insufficient refrigerant in the unit;
■ Clogging of unit pipes.
Troubleshooting:
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