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Control board no power out of board no power to fan or compressor

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Fan always runs, speed doesnt change (low/high), setting humidity level doesnt impact...is this a control board or circuit board issue?


Verify the humidity reading with another device. Perhaps the humidity sensor is dirty or bad.

Another possibility is the switching device that runs the compressor and fan is shorted. If it's a mechanical relay, the contacts may have welded together, or if it's a solid-state relay, it's got a punch-through or meltdown in a device junction. My guess is it's a mechanical relay since you mention it used to click on and off and now you don't hear that. The relay may be on the control board, or it may be mounted separately - I don't have a photo or diagram of the inside of your model available.

Jun 25, 2015 | Dehumidifiers

Tip

I see it has been suggested to perform replacement of the control board if the...


If you have a dehumidifier that is not producing any water then you are wondering what you need to do to get this thing to work for you. In some cases you may be able to do something and in other situations there may be nothing that you can do.

If you do not hear the compressor running and the unit says that the humidity in the room is higher then the setting, then you have a problem with your dehumidifier.

A few things that can cause this are:

The circuit board relay has gone bad…replacement of this board will often cost more then a new unit. This also is a very common problem with many dehumidification units.

The compressor has failed…if you hear a buzz for a few seconds, every few minutes, then you have a bad compressor or at least bad start components on the compressor. Either way it again is a costly repair.

If the compressor is running and the coils are not getting cold then you have a refrigeration system leak. Recharging or fixing these units is very difficult and is another costly venture compared to the price of a new dehumidifier.

If the compressor is running but the fan is not, this also will cause low water production and continual freezing of the coil.

If the compressor and the fan are running but the coil is totally blocked then you will get no water production. Air needs to be continually moved over the cold coil to get the water out of the air.

If nothing is running, then you may also have a control board failure. Or the humidity sensor or humidistat has gone bad which tells the machine to run. If the sensor says that the humidity is low enough then it will never run.

Also if nothing is running check the float switch or the bucket switch. Many of these switches are very touchy and if you do not have the bucket in place just exactly right it will not trip the switch to allow the unit to run. These switches often are more fragile then they should be and break easily. The good thing is that when available they are easy to replace and relatively inexpensive.

There are some parts available for a few brands, but with the prices for most of the parts that you can replace running anywhere from 40.00 – 80.00 dollars, replacement parts with labor to install them, makes a repair more then the few hundred dollar cost of many of these dehumidifiers.

As you can see there are quite a few things that can cause your dehumidifier not to work. Systematically go through the list and eliminate things to get to the bottom of the issue causing your problem and then decide if it is worth spending the money to try to fix the old unit. Only you can make that decision.

http://www.fixya.com/support/r4662033-dehumidifier_freezing_up_not_working

http://www.fixya.com/support/r3877515-dehumidifier_problems_dehumidifier

http://www.fixya.com/support/r4688381-dehumidifier_problem_shows_bucket_full

on Aug 18, 2011 | Dehumidifiers

1 Answer

Compressor will not kick on. Installed new circuit board and the compressor still won't work. The compressor does work when it is jumped.


If the fan runs, the only thing left in your case looks like the defrost control. Sorry I don't have my user ID and password for their service site here at home. I can look up a part number for you tomorrow if you'd like.

Sep 18, 2008 | Comfort-Aire BHD-301 Dehumidifier

2 Answers

My dehumidifier will not turn on


Hi,
There are many reasons for a dehumidifier2_bing.gif to not work or collect water.
Here is a tip that I wrote to help people to figure out what is going wrong with their dehumidifier2_bing.gif.

Dehumidifier is running but no water is in bucket
http://www.fixya.com/support/r4662409-dehumidifier_running_but_no_water_in

heatman101

Jun 11, 2008 | Goldstar DH504EL Dehumidifier

2 Answers

Kenmore model # 25800-25801 Error code E3 ?


You can try cleaning the humidity sensor, which is on a circuit board
housed in a nylon clip attached to the cooling coils.
The sensor is in a plastic clip, which can be opened up and cleaned.
Some report success. Didn't work for me.

I ended up rewiring the unit so that a 5v control
line from the lower relay board goes through the SPDT bucket full switch,
turning on the control board when full (so it beeps), but otherwise
enabling the compressor and fan. The fan and compressor
are controlled by relays, which are driven by a ULN2003AN
relay driver. I fed the empty side of the full bucket switch back into
the relay driver to turn on the compress and the fan on high.
I plan to put a dehumidistat in series with this control line;
now it just runs till the bucket is full. A Broan DH100W dehumidistat
is 20 bucks. Could also put in a rotary switch to control the fan speed,
but for me high is enough.

I think this machine is made by Goldstar for Kenmore and Delonghi.
Stuff is just made to break and through away these days, which is a shame.

Jun 03, 2008 | Kenmore 53701 Dehumidifier

1 Answer

Compressor runs but fan will not come on.


Disconnect the motor leads for the fan motor, check the resistance through the motor when an Ohm meter. If you get no reading on the meter the motor is bad and needs to be replaced. also check the motor by rotating the fan. If it rotates with resistance the bearings may need lubrication. If it is a sealed bearing motor and no points for lubrication are there, replace the motor.

May 26, 2008 | Goldstar DH304 Dehumidifier

1 Answer

Fan runs all the time


IF IT IS A DIGITAL CONTROL, THE FAN, HUMIDITY, AND COMPRESSOR ARE ALL CONTROLLED WITH THE MAIN BOARD THAT IS LOCATED INSIDE THE TOP WHERE YOU SELECT THE SETTINGS. YOU CAN ORDER THIS CONTROL AT A LOCAL SERVICE CENTER OR YOU CAN GET ONLINE TO SEARS.COM AND SELECT PARTS. IT WILL WALK YOU THROUGH FINDING THE PART AND ORDERING THE PART.
I EXPECT IT TO BE APPROX 150.00 DOLLARS.

Apr 05, 2008 | Whirlpool AD70USS Dehumidifier

1 Answer

DH30 Dehumidifier Compressor Does not Operate


I just picked one up at a tag sale, seller said it worked sometimes. Seems to have the same problem as yours. I took the time to tweak all of the connections and then re-soldered the control board with no luck. I finally disconnected the humidity control and it worked fine. By disconnecting the humidity control the unit defaults to it's highest setting and you have to unplug the unit to turn it off. Conclusion so far is that the humidity control rheostat is bad.
Note: Now while running the fan runs continuously and the compressor cycles on and off every 10 to 15 minutes. This may to be normal since the unit appears to be doing its job and I'm not sure how it is supposed to run since a purchased it broken.

Aug 05, 2007 | LG DH30 GoldStar Dehumidifier

2 Answers

A7dh65b2a


Normal operation, the unit has sensed icing and is in the defrost mode (compressor off and fan on high). When the ice melts normal operation will resume.

Dec 07, 2006 | Fedders A3DH30B2A Dehumidifier

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