GREE DC INVERTER HEAT PUMP CONDENSING UNIT SERVICE MANUAL
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3.4.2 “E3” Refrigerant lack protection or compressor low pressure protection
Error display:
ODU mainboard LED displayer
Error judgment condition and method:
It is judged through the action of low-pressure switch. If the low-pressure switch is cut off, it is judged that low
pressure is too low and the system stops operation for protection.
Possible reason
：
■Cut-off valve of ODU or IDU is not fully opened.
■Low-pressure sensor is abnormal.
■Outdoor or indoor fan is not working properly.
■IDU filter or air duct is blocked (cooling mode).
■Ambient temperature is too low.
■Refrigerant charging amount is insufficient.
■System pipeline is blocked.
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