Question about Dehumidifiers

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Delonghi Dehumidifier DE400P / DH400P says error Code E1

Machine worked great for 1 season. Turned it on the next season and comes right up to E1. I am very technical and have had all the covers off, checked all the connections, cleaned some crud out of the tubes, cleaned a little corrosion out of the humidity sensor connector - but can't get this thing to work or the error to go away. Any Help would be greatly appreciated. Thanks, Jon

Posted by jgelman on

  • 8 more comments 
  • Anonymous May 31, 2008

    I have the DE500P but same issue with E1 message and units gets VERY loud.

  • Anonymous Jun 11, 2008

    A few weeks ago the pump wasn't working so I pulled everything apart and found a small filter that didn't allow water to flow through it. When I removed the filter the unit worked fine. I didnn't notice any direction of flow note on the filter so I installed it reversed and it worked fine after that.



    Now the unit goes to E1 right when you turn it on. I'll try your fix...Thanks!

  • paall1 Jun 20, 2008

    Ok so I tried disconnecting the sensor from wire socket and when I turned it back on instead of getting error message E1 I now have Error message E2. My unit is less than a year old

  • Anonymous Jun 21, 2008

    error code 2?

  • christo21820
    christo21820 Oct 16, 2012

    Add a CommenRun self test first to see if this will reset unit and resolve the problem.t

  • christo21820
    christo21820 Oct 16, 2012

    To Run Self Test

  • christo21820
    christo21820 Oct 16, 2012

    1. Unplug unit

  • christo21820
    christo21820 Oct 16, 2012

    Hold down Mode button while plugging unit back in. Self test will automatically start.

  • christo21820
    christo21820 Oct 16, 2012

    The E1 error and symptoms of my unit:

  • christo21820
    christo21820 Oct 16, 2012

    Humidistat not reading correct ambient RH. Defaults at 90%RH.

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3 Answers

christo21820

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Posted on Oct 16, 2012

  • 2 more comments 
  • christo21820
    christo21820 Oct 16, 2012

  • christo21820
    christo21820 Oct 16, 2012

    Run self test first to see if this will reset unit and resolve the problem.

  • christo21820
    christo21820 Oct 16, 2012

    sorry....system is not letting me correct my solution. It posted but lost my text.

  • christo21820
    christo21820 Oct 16, 2012

    Run self test first to see if this will reset unit and resolve the problem.

    To Run Self Test:

    1. Unplug unit

    2. Hold down "Mode" button

    3. Plug in unit while depressing the "Mode" button

    4. Unit will automatically start self test of all functions



    E1

    Sensor Error:

    Humidistat not reading correct ambient RH. Defaults at 90%RH

    Display flashed "E1" and shows 90% RH on right hand side of screen

    Unit was otherwise running fine but with this problem, I suspect it would not automatically shut off when user selected RH setpoint was reached.





    Solution: Locate humidistat that is mounted in a plastic housing clipped to on of the coils on the evaporator coil. The evaporator coil is behind air filter cover. Checked humidistat wire harness connections for corrosion and tested with volt meter 5-8 volts?? Ohmed out humidistat (the sensor itself on the humidistat board) and tested change with breathing on sensor. Humidistat appeared to be functioning as the ohms would change with changing RH. Do the following procedure at own risk!!!! Connected humidistat to harness, turned unit on and tested the backside of connection on circuit board with volt meter to determine if voltage was passing through connector properly. This would rule out bad connection inside connector. Connection tested fine as we could read volt on backside of connector for two outside pins. While checking center two pins, accidentally shorted across two pins and unit turned off automatically and reset. These are very small pins and my meter probes were not of the very fine point type for very small connection probes which made this very difficult and risky. This was by total accident and I thought I might have damaged something when the unit reset, but fortunately, this is what fixed the problem with the unit. This must have triggered a reset of the calibration of the humidistat sensor/circuit and the unit started functioning normally. Display started showing correct humidity at 44%RH. "E1" message went away. Turned unit on and it is functioning correctly now with no E1 message. Shorting across the two center pins of the humidistat connector did fix the problem on my unit, but I caution that the fact of shorting across pins could result in damage to the unit. If you do this, only short for an instant by touching between the two pins very quickly and releasing. Hope this works for you if you are having this same problem. Follow up....I just spoke with a DeLonghi authorize repair tech and told him about this and he said what I did was probably trigger the system reset, cleared the memory for the humidistat function and this reset the humidity function to be properly calibrated and operate correctly. I couldn't confirm that moment but said that he has seen that before with other appliance boards and that this was likely the case. I just ran across it by accident.

    Run self test first to see if this will reset unit and resolve the problem.

    To Run Self Test:

    1. Unplug unit

    2. Hold down "Mode" button

    3. Plug in unit while depressing the "Mode" button

    4. Unit will automatically start self test of all functions


    E1

    Sensor Error:

    Humidistat not reading correct ambient RH. Defaults at 90%RH

    Display flashed "E1" and shows 90% RH on right hand side of screen

    Unit was otherwise running fine but with this problem, I suspect it would not automatically shut off when user selected RH setpoint was reached.



    Solution: Locate humidistat that is mounted in a plastic housing clipped to on of the coils on the evaporator coil. The evaporator coil is behind air filter cover. Checked humidistat wire harness connections for corrosion and tested with volt meter 5-8 volts?? Ohmed out humidistat (the sensor itself on the humidistat board) and tested change with breathing on sensor. Humidistat appeared to be functioning as the ohms would change with changing RH. Do the following procedure at own risk!!!! Connected humidistat to harness, turned unit on and tested the backside of connection on circuit board with volt meter to determine if voltage was passing through connector properly. This would rule out bad connection inside connector. Connection tested fine as we could read volt on backside of connector for two outside pins. While checking center two pins, accidentally shorted across two pins and unit turned off automatically and reset. These are very small pins and my meter probes were not of the very fine point type for very small connection probes which made this very difficult and risky. This was by total accident and I thought I might have damaged something when the unit reset, but fortunately, this is what fixed the problem with the unit. This must have triggered a reset of the calibration of the humidistat sensor/circuit and the unit started functioning normally. Display started showing correct humidity at 44%RH. "E1" message went away. Turned unit on and it is functioning correctly now with no E1 message. Shorting across the two center pins of the humidistat connector did fix the problem on my unit, but I caution that the fact of shorting across pins could result in damage to the unit. If you do this, only short for an instant by touching between the two pins very quickly and releasing. Hope this works for you if you are having this same problem. Follow up....I just spoke with a DeLonghi authorize repair tech and told him about this and he said what I did was probably trigger the system reset, cleared the memory for the humidistat function and this reset the humidity function to be properly calibrated and operate correctly. I couldn't confirm that moment but said that he has seen that before with other appliance boards and that this was likely the case. I just ran across it by accident.

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Anonymous

I believe the filter is actually a type of back flow valve. I pulled it off, cleaned it out with some bleach and water, put it back on in the same direction.
It works fine. Quiet with not errors

Posted on Jun 24, 2008

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Anonymous

Hi.
It is simple and easy to fix. E1 code for sensor behind right side grill. Take right side grill out, unplug sensor from wire socker and plug back. It is solve problem sometimes. Unit MUST be unplugged from outlet.
If no help, you need new sensor .

Thank you.
Dimitry.

Posted on Jun 09, 2008

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