Gree U-Match 6 Series

GREE U-Match 6 SERIES UNIT SERVICE MANUAL
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3.4.5 “E4” Compressor Air Discharge High-temperature Protection
Error display:
ODU mainboard, IDU wired controller and IDU receiver light board will display E4
Error judgment condition and method:
Test the compressor discharge temperature through compressor discharge pipe. If the tested
temperature value is higher than 115
℃
, 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;
Troubleshooting: