Question about Danby DDR401 Dehumidifier

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20% humidity reading

Is my humidity sensor circuit board toast? after cleaning my dehumidifier, and letting it dry. i plugged it in and it gave a reading of 20% humidity. when i blow on the humidity sensor, the humidity reading climbs, but quickly falls to 20% again. I know that the humidity is higher that 20% in my house (the windows are fogging up, and i have another humidity meter that is reading around 59%). any advices?

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Re: 20% humidity reading

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

Posted on Sep 20, 2007

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Dec 26, 2011 | Fedders A7DH45B2A Dehumidifier

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Unir ran good for 8 months then cut off with current humidity reading LO. Humidity is not LO. Have to set below 40% then runs all the time. The AUTO humidistat sensor must be broke. 1 year...

In addition to a faulty humidistat sensor, there are 5 basic, yet solvable reasons for what you described. Please pay particular attention to numbers 1 & 2.

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 applications. 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

If none of the above solves the problem, contact Haier Customer Support
1-877-337-3639, before your warranty expires.Haier units will generally show an E1 code if a sensor or circuit is faulty and unit will not run at all.

I hope this helped you troubleshoot & solve the problem

Aug 11, 2011 | Haier DE65EJ Dehumidifier

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I have a GE AHH50LMG1 dehumidifier. It is less than 2 years old. When I turn it on, it displays 20% RH. The fan runs but the compressor does not kick in. I assume that is because it thinks the humidity...

It could be just the sensor, but not likely... many times it is the circuit board that goes bad, making the repair almost prohibitive.. as the circuit board, if you can find one, is often half or more the cost of a new unit...
But you are correct... if the unit thinks the humidity is 20% then it will not bring on the compressor...that is what is happening...


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Bucket full light flashes, humidity setting won't change - only says 01


Here is a tip that explains what can be happening to make the dehumidifier showthat the bucket is full when it is not.

Dehumidifier Problem It shows Bucket Full


Jun 07, 2011 | LG LHD459EL Dehumidifier

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I have a 50 series w/ digital humidity level readout. Recently unit reads the room at 30% humidity so it shuts off unless preferred setting is set to continuous. Can the sensors go bad that measure the...

If the humidity level is at or lower than 30%, the unit won't turn ON, until the reaches 35 - 40%. It's rare for the sensors to go bad. Just keep in mind, the dehumidifier is reading the humidity near the floor, not up at say, chest level. Humidity levels change every season, so this really would not be that unusual. Make sure that your clean the air intake filter regularly. Cleaning and wiping down the coolant coils would be a good idea, too..

Hope this helped you. Please let me know.

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Humidity sensor reads to low and does not kick the machine on. The readout seems to always be at 20% and wont kick on till 35% Is there an adjustment i can make to tuen the unit on?

It probably doesn't need adjusting, It's simply a case that 20%, there's not enough humidity for the sensor to read. But, at 35% there is. I'd say, your dehumidifier is working as it should.
FYI - there is no adjustments to change the factory settings.

Hope this helped you, chu.

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I have an lg dehumidifier LHD 45EL. The humidity reading reads 15% higher than a stand alone humidistat and the unit will go on for a short time even though the set humidity level is 70%. What gives?

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