Predator S20PLUS Manuel D'instructions page 48

Internal Tank Water Full Alarm Function
The inner water tank in the air-conditioner has one water level safety switches, it controls
water level. When water level reaches an anticipated height, the water full indicator lamp
lights up. (If water pump is damaged, when the water is full, please remove the rubber
blockage at the bottom of unit, and all water will be drained outside.)
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