GREE U-Match 5 SERIES UNIT SERVICE MANUAL
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3.4 Troubleshooting
3.4.1 “E1” Compressor High Pressure Protection
Error display: ODU mainboard, IDU wired controller and IDU receiver light board will display E1
Error judgment condition and method:
It is judged through the action of high pressure switch. If the 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 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
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