Gree GMV5E Series Service Manual page 180

GREE
2.2.4.57 "E4" Compressor high discharge temperature protection
Error display: ODU mainboard, IDU wired controller and IDU receive light board will
display
Error judgment condition and method:
Test the compressor discharge temperature through compressor discharge pipe and shell top
temperature sensor. If the tested temperature value is higher than 118 °C , the unit will stop for protection.
Possible reason:
■Cut-off valve of ODU is not fully opened;
■Electronic expansion valve is abnormal;
■Outdoor or indoor fan is not working properly;
■IDU filter or air duct is blocked (cooling mode);
■Ambient temperature exceeds allowable operation range;
■Refrigerant charging amount is insufficient;
■System pipeline is blocked;
GMV5E DC INVERTER VRF UNITS SERVICE MANUAL
176