GREE Duct type Ducted Type Split Air-Conditioner Units
96
Possible reason：
1) Cut-off valve of ODU is not opened.
2) Low pressure sensor is abnormal.
3) Outdoor or indoor fan is abnormal.
4) Filter screen of IDU or air duct is blocked (cooling mode).
5) Ambient operation temperature is too low.
6) Insufficient refrigerant charging quantity.
7) System pipeline is blocked.
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