Question about DeLonghi DE40P Dehumidifier

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DeLonghi Dm10 This may be a ridiculous question, but I have just brought this dehumidifier, turned it on and it merrily filled up 2 tank fulls in the first day. I switched it off when I went out and then turned it on to 'continuous' again when I returned. Since I have turned it on again...not a drop - is my house fully dehumidified after just 1 day? Can this really happen when I have just put out 2 loads of washing? The power light is other lights tell me that there are any other problems! It all appears as if it should be working! I have even moved it to another room and left it to stand all day (not on) then plugged it in in the evening and still no water in the tank (after 12 hours)???? Thanks in advance for any advice!

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6 Suggested Answers

  • 883 Answers

SOURCE: Really thick ice on back of dehumidifier

It is now frozen because the humidistat, which controls the on/off cycle, is starting to age and forgetting to turn off the dehumidifier. Try removing the humidistat and, using compressed air, blow it out thoroughly of any dust. Then spray the rotary control area, including electrical parts, with WD-40. Then, blow dry again with the compressor and try again.

Posted on Jun 24, 2007

SOURCE: DeLonghi Dehumidifier pump out failure

I have the same problem. Very annoying. My suggestion is to go to your nearest dealer and throw the unit through their front window.

Posted on Aug 04, 2007

  • 105 Answers

SOURCE: DE400 dehumidifier

Go to site...
in top search box show user manuals
go to search data base find delonghi- then type in de400 humidifier
then download

Posted on Sep 15, 2008

  • 3 Answers

SOURCE: Delonghi Dehumidifier DE500P - Code E3

Hi Thomast5263,
I live in NJ and the nearest center is in CT. So you can imagine that I am not gonna to ship my unit! :-)
The one I got is from Hartford, CT Utility Electric Service: 860-246-7271; talk to Dana and he is very helpful. They charged me $25 and shipped me the part and it now works fine.
When I talked to Dana he sounded pretty sure it was the condensor sensor. Simply call Dana and tell him that you have an "E3" code. I do NOT know the part number or ID.
Don't open the unit until you get the new part ---- it will help you to identify the part to be replaced. After you get the part, make sure you mark down all the screws (they are not the same! so pay attention which one is where). There are two tabs on the top so be careful when get them separate apart ---- don't force it or you might break it. The sensor itself is attached/stuck in between the copper coils under a black cover. Plug another end to the control board and you are done. Apparently there are two kinds of plug-in end ---- the first part Dana shipped to me did not match the old part so he has to send me another one which worked.
The whole procedure is not that difficult, but when you are doing this the first time you just need to be patient to locate all the screws and sparate the covers. From my experience you do need to take all covers off, otherwise you can not see the part and the wire.
Good luck to you and let me know the good news!

Posted on Oct 23, 2008

  • 72 Answers

SOURCE: delonghi de400p dehumidifier does not work

if comp and fans running your out of freon or the compressor is not pumping more than likely out of freon and that means theres a leak in the sealed system high cost repair

Posted on Jul 03, 2009

  • 104 Answers

SOURCE: Error code E3 on delonghi dehumidifier DH400P

Be Safe or don't do it....

On the side with the lint screen, remove the five screws holding the top panel in place. The sensor that needs to be checked in mounted on the radiator fins. Remove the sensor and 4 pin connector. With a pin, remove the loose fitting housing the "sensor"...a circuit board that "shorts" with condensation...check corrosion and look for component damage on the oft chance the circuit board was damaged by some inappropriate poking or mechanical failure. Reassemble and replace sensor...

For a short life span...or out of warranty and only at your risk (IF have significant other or kids or pets or human DNA... don't do this...) .. guide wire through screen notch and attach to outer screen. Build fortress around exposed sensor and talk to insurance agent for a special rider...seriously be careful.

Did you? Clean screen and GENTLY clean fins of lint, etc....(vacuum's brush head should do the trick...)

Taking all appropriate safety precautions.


Here's the 100,000 (yen) tip....with humidifier unplugged, hold down the power button (green button in lower center) and plug in the appliance.

Watch the LCD screen as it conducts a self test...and wha...lah!.

Should have a working humidifier!

(your welcome).

no really..."de nada". :"don't touch your moustache" "Doye toche moche"(?), "prego".

Posted on Mar 27, 2011

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these humidifiers are total junk. The sensors are cheap and get stuck or broken so easily. for your problem tho, you can either find the sensor by taking off the cover and use your hands to break free any stuff causing it to get stuck or you can drill a hole in the water tank and insert some fish tank tubing and let the water drain out as it collects.

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The water tank is either full or not positioned correctly. Empty the tank and/or make sure it is positioned correctly (should fit perfectly and not bump out from rest of unit).

If you have it connected to the drain directly, your tank may still be filling up unless you have the PUMP button pressed (and PUMP is showing in the LED screen).

Good luck and please rate me.

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My DeLonghi Portable Dehumidifier Model DEM10 has stopped working. It doesn't make the same noise when you turn it on anymore i.e the slight refridgerator sound. Does this sound like a repairable problem...


First, make sure the reservoir is empty. If you plug the unit in and see a green power light, but the unit won't run, make sure the reservoir is properly inserted. Many dehumidifiers have switches or sensors to make sure that the reservoir is placed so that it won't leak. Look for these sensors and make sure the reservoir is engaging them. If your dehumidifier has a float or switch to indicate a full reservoir, make sure this switch isn't being tripped accidentally.

Good luck.

Aug 13, 2010 | DeLonghi Dehumidifiers

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When tank is full, it doesn't shut off, and tank overflows

yes jenn when the tank fills it will shut off so that it dosent run all over the floor on many models you can hook a hose on to the tank and find a place to drain itto like a floor drain etc

Apr 09, 2010 | DeLonghi DE500P Dehumidifier

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My DeLonghi DEM10 wont power on any more - like fuse gone

The tank may be full. Your dehumidifier has a safety device that turns off the dehumidifier when the water tank is full. Usually the tank itself either presses against a switch or there's a device connected to the tank that triggers a switch when the tank is in place and full.

If you've emptied the tank and the unit doesn't run, inspect the place where the tank rests to see if there's a switch or mechanism that's not being activated. You may be able to turn it on with a simple flick of your finger.

Sep 03, 2009 | DeLonghi Dehumidifiers

2 Answers

DeLonghi 50 Pint dehumidifier DE 500P won't turn back on

If it is not responding when you try to activate the shutoff button and are still not recieving an acknowledgement that the bucket is full you may hav a defective shutoff button. Try contacting the Manufacturer and see if you can purchase just the button. This i a common part and the price is usually reasonable. If you feel very technical inclined you can remove the button and touch the 2 wires together simulating a closed contact. The dehumidifier should now acknowledge the bucket is full. If you recieve the notification then the button is bad. If you found this solution helpful please rate it.

Thanks - Tech101

Sep 04, 2007 | Dehumidifiers

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