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FDL70S1 Compressor will not run fan comes on compressor will run if you bypass relay on board is there a sensor that turns on the 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

How do you check refrigerant in model ad50uss?. The fan is working and I think the compressor is coming on, but after a little while of running the coils do not get cold. Thanks


Turn the unit on and put you hand on the copressor to see
if it's vibrating. If so then it could be low refrigerant or a worn
compressor.
If it's not vibrating then I would check the thermostat,
compressor relay, and compressor for continuity.

Oct 14, 2013 | Whirlpool AD50USS Dehumidifier

1 Answer

Unit fan is running but the compressor is not.


Hi,
It could be a bad compressor, circuit board, or maybe even a sensor or dehumidistat...
Here is a tip about dehumidifiers that run but do not extract water from the air..

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

heatman101

Apr 24, 2010 | Maytag M7DH45B2A Dehumidifier

1 Answer

Oil in my water reservoir for my Frigidaire FDL70S1 Dehumidifier


could be oil from a fan motor or compressor, either way thats not good

Apr 10, 2010 | Maytag M7DH45B2A Dehumidifier

1 Answer

Fan kicks on but compressor does'nt start. Humidity control checked out. Compressor ohmed out. Fan runs for about a minute then it shuts down.


i would do a continutity check on you relay and overload, other than that
what is the humidity level in the room, as well as the ambiant temp. these mahines cycle for that very reason, the fan will come on, do a check and then determine if it should start the compressor.
check if you have voltage at the compressor when its supposed to be running ( just a last thought)
ive seen compressors ohm out, but in fact be bad

Oct 09, 2009 | Kenmore 54351 Dehumidifier

1 Answer

Kenmore 580.51650000 dehumidifier: compressor cycles on and off as it should based on humidity setting but the fan is always running, even with the compressor off. Checked humid sensor. Any other...


fan should turn off when compressor not running, the relay switch is stuck open for the fan, and probably needs replacing, but even if it always runs there is no harm and it only uses like 15 watts

Aug 21, 2009 | Dehumidifiers

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

3 Answers

Whirlpool 50 pint dehumidifier


Lifeguard, there are generally no user accessible safety items in dehumidifiers. You are likely describing the start relay which is used to 'boost' the compressor on starting. Jumping it will not help you. It sounds like the compressor is defective. Economically, there is no justification for servicing these units unless they require refrigerant gas or if the fan motor has seized, something you can readily determine. If you don't hear the compressor hum when it should, there is no service procedure available for these sealed units.

Feb 22, 2008 | Kenmore 54501 Dehumidifier

4 Answers

HDN655E Haier dehumidifier


The fuse is not really needed. Look at the sticker on the compressor in the back and you will see it is rated at 30 LRA which is locked rotor amps. Obviously if the compressor fails to start instantly for any reason that 30 amps is going to blow that 12 amp fuse (which is a fast acting instead of a slo-blo for whatever dumb reason).

The fix is simple, move the black wire that comes from the power cord from the terminal marked L in the lower right corner of the board to the unused terminal marked common on the big relay in the lower left of the board directly above the fuse. This will bypass the fuse and allow the thermal cutout on the compressor itself to do its job when the compressor fails to start due to short cycling.

I just had one of these units given to me because it was DOA and when I found the fuse blown I figured the compressor was shorted but after performing this fix the unit works perfectly and is drawing a normal amount of power according to my Kill-A-Watt meter.

Jun 01, 2007 | Haier HDN655E Dehumidifier

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