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Hello, the chinese made AC units have electronic controls made as inexpensively as possible, they are failure prone, and quite difficult to diagnose.
In China, at $1 per hour labor rates. diagnosis and repair is quite viable, here in the US a $100 per hour labor rates it is often cheaper to replace the entire unit..
That said, remove the water condensate bucket and look for two rods or a float positioned so that it can sense water level about to overflow in the tank, and clean that real well.
Let me know how it goes,