No Start
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Check the dehumidifier's power supply. Make sure it is fully plugged into an electrical outlet and that the circuit or fuse on which the outlet runs is operational. Replace any blown fuses or reset any tripped breakers.
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Empty the dehumidifier's bucket. It will not run if it is full.
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Verify that the water bucket is correctly positioned in its compartment. Pull it straight out of its compartment, then gently push it straight back in.
No Dehumidification
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Move any blockages, like blinds or furniture, from the front and back of the dehumidifier.
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Set the humidity control to a lower setting.
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Close all openings to the outside in the room in which the dehumidifier is situated.
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Increase the temperature of the room in which the dehumidifier is situated. It must be at least 41 degrees Fahrenheit.
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Remove any appliances, such as kerosene heaters, that emit water vapor.
Miscellaneous
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Clean the air filter if the dehumidifier operates louder than usual. Pull it out of the side of the dehumidifier and clean it in warm, soapy water. Rinse it and allow it to dry before placing it back in the machine.
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Check all hoses to be sure they're securely connected if water is leaking onto the floor. Secure any loose connections.
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Pull the dehumidifier's plug, then plug it back in, if the error code "AS" appears on the screen. This indicates a humidity sensor error. If the problem persists, call Comfort-Aire customer service.
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Give the dehumidifier's defrost cycle time to run if "P1" appears on the display. The message will go away when the automatic cycle is over.
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Remove the bucket, empty it and replace it if "P2" shows in the display. This indicates the bucket is full.