Question about DeLonghi DE400P Dehumidifier

2 Answers

Hi I have a delonghi dehumidifer with pump. HOwever, it is not pumping the water out and the reservoir keeps fill up instead. It is supposed to be able to pump it 13 FT up into the air but it can't pump the water straight out about 5FT. The dehumidifer keeps thinking the line is obstructed and the pump light will flash and water will go into the tank. The pump is loud and doesn't move the water fast and the water sometimes seems to be pulled back to the machine vs. out of the hose....it only drips out. I purchased it online and can't return it but it may be under some sort of warranty.

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  • Anonymous May 21, 2008

    Same problem with 50 pint unit.


  • JFFLYNN Sep 05, 2008

    The water is not being pumped out through the tube but it fills up the bucket and we have to manually empty out the bucket twice a day which totally defeats the purpose of having automated pump system.

    Please help.

    Thanks


×

2 Answers

Check to see if the filter before the pump is plugged or restricted.I washed mine out with a bleach/water solution.

Posted on Jul 21, 2008

What I found was that the evaporator coil has steel endplates that flake rust off into the resevoir. This clogs and destroys the pump.

Posted on Jun 22, 2008

  • Fred Peterson Jun 07, 2012

    Guest is correct. My 65 pint unit also had its pump destroyed by rust flaking off the steel end plates. Why would they use steel? Don't they know that copper (tubes) in contact with steel or iron causes galvanic action and rapid rusting? Faulty design?

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1. Remove the overflow water tank and the two side covers (five screws in each). Note that as you go through the removal of all the covers and other procedures, there are two lengths of screws; don't switch them. If you lose track, the rule of thumb is use the short screws for going through a single layer of plastic into metal.

2. Remove the rear cover (take out the screws along the bottom and on the sides). It will still be attached to the front top cover at the top with tab fasteners. Gently pull out the bottom of the cover while depressing the top of it on both sides with your thumbs (about an inch and a half inside the trim ridges) to clear the tabs. Ease the top part of the cover back and remove it (it will have to tilt to one side, don't forget this when putting it back on).

3. Remove the top cover, not forgetting the two screws on top by where the back cover attached (go gently, there's a wiring harness) and turn it to the side. There was enough slack to leave the wires connected; just be careful to not damage them.

4. The filter looks like a small transparent in-line gas filter. Remove the pump filter, leaving the short tube attached to the top of it. I quickly atttached a length of tubing to drain the reservoir into a bucket. I couldn't find a replacement filter, so I filed a slot in the side of the bottom half of it to remove the gunk using the wire from a twist tie (the upper half had some tabs inside that would have been in the way). Afterwards, I wrapped it tightly with stretchy electrical tape and put a cable tie over the tape at the slot to keep the tape from being able to creep loose over time. Don't use a fuel filter, the paper element is too fine (you need a screen) and the paper will fall apart in water.

4. Remove the float and bracket from the pump reservoir. The reservoir screws are not all apparent; there's also a screw way over on the left and one coming in from the right. I used a 12 inch #2 phillips screwdriver with a magnetized tip for most of this. Remove the pump reservoir and clean out the scummy stuff in the bottom and where the tubes attach. When removing the reservoir, you'll have to detach the vent line that goes through the bulkhead to where the big tank was and pull the tab above it down slightly while easing the tank out.

5. Clean out any dirty tubes, paying particular attention to the coupling for the drain hose and the long drain hose itself.

6. Put the reservoir back in and hook up all the tubes and filter. It does make a difference in which direction the filter goes back in. You want the water from the reservoir to go through the filter from the outside of the little screen; that leaves the maximum room for crud build-up before it plugs up the screen again. Newer ones have a flow direction arrow; point it away from the reservoir.

7. Depending on your confidence level, at this point you may want to plug in the dehumidfier, put the overflow tank in, turn it on, turn on the pump, and fill the pump reservoir to check for functioning and leaks. If you do this, just remember that the circuits are hot and not all are insulated.

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