GREE DC INVERTER HEAT PUMP CONDENSING UNIT SERVICE MANUAL
30
Possible reason
：
■Cut-off valve of ODU or IDU 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.
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