Question about Whirlpool AD40USR Dehumidifier

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Fan no compressor will run

I have a Whirlpool dehumidifier that is only a couple of years old in my basement. The fan has always run continuously, though the compressors kicks on and off. Everything has now stopped running. The control panel lights are on, but it won't run. The bucket is empty and properly seated. Any advice?

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  • mdj54 Jun 05, 2008

    AD75USTO

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I have AD75USTO. Whirlpool  was running yesterday. Today it sound like its starting but will not boot up fan will not kick on. Does it need resetting or what. Only a year old only used for one summer?

Posted on Jun 05, 2008

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Why does compressor continue running, even with dehumidifier turned off?


Hello Bernard, thank you for your post!
I see that you are experiencing an issue with the Frigidaire dehumidifier, FAD704DWD, compressor consistently being on. This could be a possible issue with your control panel or sensor. Since it could be any one of these underlying issues I would suggest contacting the manufacturer for further assistance. Hopefully this information is helpful to you. -Matt

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IIt may very well be that the the air intake filter needs to be removed and cleaned. But, before doing this, turn the unit OFF & unplug it. Allow the unit to completely thaw, before removing the filter.Never operate the unit without the filter in place, As this could damage the unit.

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Product is about 6 years old. Used in basement. Worked great until this year. Now will run continuously but collect little water. What type of service do I need? This is a 65 pint per day Whirlpool.


There is some service that you can do ... Clean the filter and the cooling coils, regularly. Check the humidity level that you have the unit set on. It may be set to low and there's just not that much humidity in the air at this time, for it to collect. From what you said, it sounds like you may have it set on continuous cycle which could account for the lack of a lot of water in the bucket. In continuous run, the fan stays ON all the time. It's supposed to do that, so that the air is constantly moving and the sensor only turns the compressor ON, if it senses a humidity level 5% higher than what you have it set for. Try running the unit on a 1 or 2 hour cycle (if your model will do that) rather than continuous cycle.

Hope this helped you troubleshoot and solve the problem. Please let me know. Thanks.

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Compressor and fan both kick on when starting. Frosts up (normal for this time of year) but then compressor stops but fan continues to run but compressor does not start up again....


From what you have described, it sounds like the defrost sensor may be bad. However, if you're operating the unit in a temperature of 40 degrees or lower. That's the problem. If in a basement application, keep in mind the floor temperature is lower than the air temperature.

Also, cleaning the air intake filter on a regular basis will help.

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