Question about Fedders A7DH45B2A Dehumidifier

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Runs all the time and no water in bucket

I have two exact units hooked up right next to each other ,settings and readings are exact in every way ,the one i am concerned about got 1 inch of water the new one is full.the one thing different is the exhaust air coming out the top the one that is working well is warm , the one that is not working is cool. whats wrong? I bought both these units at the same time, they are 3 years old ,I have been using the one there is a problem with for three years the other one for only a couple days. whats wrong???

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Clean off the coils in the back and the filter (if it has one) and fins in the front (you may have to remove the case). if the front is not warm and the coils are not cold or they are iced up, you have low refrigerant.

Posted on Jul 30, 2009

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Possibly a dirty filter

Posted on Jul 30, 2009

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1 Answer

I have a brand new dehumidifier, it was running for several hours and did not pick up any water in the bin. I called customer service that said I must hook up the automatic pump drain for 3-4 days before...


Apparently, someone in customer service was try to blow you off, with answer that is not even reasonable.

There are 5 basic reasons for what you have described. Not all may apply to yo, but they are worth knowing for future reference. Number 1 is the most prevalent and overlooked.

1. The humidity extraction level is set to HIGH. Lower it to 32-35%.

2. Air intake filter is dirty or clogged. Turn unit OFF, & Unplug the
Unit, before removing to inspect & clean it, if necessary. If washed,
allow filter to completely dry before reinstalling. DO NOT operate
the unit without the filter.

3. Obstructed air flow. Maintain a minimum of 12 to 18" of clear air
space around the entire unit.

4. Cooling coils are dirty and need to be cleaned. Use warm water & dish washing liquid to
clean the coils. Rinse and wipe dry. Apply a light coating of WD40 to the coils.

5. Ambient air temperature at floor level is between 40 - 60 degrees.
dehumidifiers do not work well between those temperatures
(Unless, you have a Low Temp Unit). This applies mainly to
where the air temperature at floor level is colder than at shoulder level
in basement application. Raising the unit up off the floor,
onto a sturdy table, counter top, etc, that can handle the weight
of the unit, plus a full tank of water, will usually resolve this
problem.

As I mentioned before, not all of the above may pertain to your application, but it's worth knowing for future reference and for the moment one or two of the things listed may help you now. If you continue to have problem with the unit, advise Frigidaire, that you would like to enter a warranty claim for repairs. Believe me, they will go out of their way to help you then.

Jul 21, 2011 | Frigidaire FDF50S Dehumidifier

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I just bought a LG Model LD650AL two days ago from Home Depot. My question is when I hooked it up and started it, it ran for awhile (15mins) then it stopped. Seems to me that it a quite warm behind the...


If you just plugged it in and started it up, you may have failed to set the humidity extraction level. Which is different from the factory settings. If you want to remove great deal of humidity, lower the setting to 35%. Keep in mind, the lower the setting the more humidity/moisture will be removed from the household air. The higher the setting less will be removed.

As far as the unit beiing warm is concerned ... Be sure to maintain at least a minimum of 12" clear air space all around the unit while in operation. Do not operate the dehumidifier in direct sun light.

Also, make sure all the packing material has been removed from the interior of the unit. This will block the airflow and cause the unit to overheat. If it does overheat, it should shutoff automatically. But, don't confuse that with normal automatic shutoff (i.e water collection bucket full, timed cycle has ended, no more humidity to remove from the air, etc.)

When all else fails, consult the owner's Manual.

Hope this helped you. Please let me know.

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At this time every year I turn on my Fedders A7DH45B2A Dehumidifier in my finished basement. I turned it on the other day and it will not extract water. I have a humidity meter in one bedroom it is 67%. I...


Bob, the unit may not need to be recharged. I may simply be a matter of the humidity extraction level on the unit is set to high. Try lowering the extraction level to 35% or if your dehumidifier doesn't have a LED screen, set to maximum. In addition, be sure that the unit has at least a minimum of 12" clear air space all around the unit.

As far as recharging is concerned, it's like recharging the air conditioner on your car. But, in this case, your mechanic can't or won't recharge the dehumidifier. So before any recharging is done, I would like you to do this in home test.

Move the dehumidifier to the bathroom. Turn the shower on hot enough to generate steam. Do non turn on the bathroom's exhaust fan and close any open window(s) in the bathroom, Turn the dehumidifier ON and set the extraction level at 35%. As you exit the bathroom, close the door. Wait at least 15 to 20 minutes before returning to the bathroom. Ten turn the shower OFF and allow the unit to run an additional 5 minutes. Then check the water collection bucket for water. If you find any, the unit is working as it should. In which case, the humidity extraction level was originally set to high. If there are no signs of water, then the unit needs to be recharged with refrigerant. At that time, if there is a leak, it will be detected. As far as the cost of servicing and recharging is concerned, depending on where you live, it could be up to $100.00 or less.

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

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I have a DANBY PREMIERE R410A dehumidifier. I have misplaced the manual. I want to have the unit run for a fixed period of time (not all the time). HELP!!!


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(The left # will just blink once you have the time you want just leave it and eventually the normal humidity setting reading will show)

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Hi, I just cleaned my dehumidifier and had the same problem as you. I used a spray water bottle and was not aware that the humidity sensor was being soaked. Very stupid of me!! Luckily I have two same dehumidifiers and used the other sensor to replace the one that I so stupidly ruined, and behold my machine worked again. Now I have to buy another sensor. To make sure we are talking about the same thing, my sensor is white,about 1 inch by 1/2 of an inch. It as 4 wires connected to it. To access it you remove the water tank, you will see 2 screws. Remove those, and pry the front panel loose. Be careful the top of the panel is held by two plastic hooks, they break easy. The sensor is located on the right side just above the radiator, under a produting oval lip which as foam around its rim. The wire colors are red black blue and yellow. Good luck Herman

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