Hisense AW0621CR1W Use And Installation Instructions page 16

The temperature of the room you are trying to cool is
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extremely hot. Allow extra time for the air conditioner to cool
off a very hot room.
Windows or doors to the outside are open. Close all
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windows and doors.
The Temp control is not at a cool enough setting. Adjust
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the T emp control to a cooler setting by pressing the minus
button to reduce the temperature. Set the Fan Speed control
to the highest setting.
Water drips from cabinet into your house
The air conditioner is not properly leveled. The air
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conditioner should slope slightly downward toward the
outside. Level the air conditioner to provide a downward
slope toward the outside to ensure proper drainage. See the
Installation Instructions.
NOTE: Do not drill a hole in the bottom of the metal base and
condensate pan.
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