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Hi! Thank you for your question. This air conditioner has an internal tank to hold accumulated water from the condenser. Normally, this water is evaporated and exhausted to the outside. However, in periods of high humidity, the internal tank may become full. If this happens, “FL” will appear on the display, a tone will sound, and the air conditioner will turn off until the internal tank is emptied. Hope this helps! :) -Customer Service Team
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