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Compressor Doesn't Engage

Dear Mr. Kolb, I'm an American living on an island off Hong Kong. I'm a fairly skilled mechanic with at least some tools here. My Delonghi CF08E dehumidifier (manufactured 2005 and sold as a Gree) has worked fine the last several years, but recently the compressor won't engage, though the fan runs OK. From what I've been able to see online, it may be an issue with the anti-frost or humidity sensor, or with a possible fuse serving the compressor only. I'd like to get inside to see what might be seen, but need to find a split-blade screwdriver head to remove the middle pair of exterior screws front and back, obviously a manufacturer's anti-tamper device to keep the unwary/inexperienced from disassembly. No service people will come to the island, even if I wanted them to, but I'm perfectly capable of diagnosing and repairing at least some problems. It would be helpful if I could see or download a genuine service manual online, one with a schematic and parts blowup. No luck finding this so far, and calling service departments here in HK is hopeless. Unlike westerners, esp. Americans and Australians, very few Chinese do any DIY themselves, nor are the service folks helpful even if they happen to speak limited English. I'd be grateful for any suggestions. Again, the unit worked perfectly until just recently, with no audible compressor symptoms, and normal cycling/rates of condensation. Ambient temp has been 60-70 F, 15-21 C, high enough for the compressor to kick on. Thus I think juice is simply not getting to the compressor, the fault likely being a sensor or fuse in between. Sometimes of course fuses simply fail, or, in HK's long, extremely humid summers, contact points oxidize. I'll be back in the states for several weeks next month, and can probably get most parts there far more easily than here. In the meantime, I'd like a service manual to help take the unit apart without inadvertently breaking anything. Many thanks!!--George

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Posted on Jan 02, 2017

Buffalo12980
  • 625 Answers

SOURCE: Haier HDN655E unit runs but compressor won't kick in

use a jumper cord and go directly to the compressor to see if it will run. if it don't run, open up the motor box and see if there is a klixon overload inside. this should be normally closed. if it isn't replace it. the klixon is a thermal overload cutout. it usually trips because of high winding temperatures and protects the motor inside. the compressor is a hermetically sealed unit. no, or little freon will cause the motor to overheat.

Posted on Aug 21, 2007

  • 184 Answers

SOURCE: Haier HDN455 dehumidifier fan runs continuously but not compressor

First ! you are trying to use this dehum in cold weather conditions. this time of the year there is little humidity in the air. best conditions for the dehum to work will be when the temp. is 65 degrees or high, and the humidity is 60% or higher. if you don't trust what I said then take it to sears to be checked out.

Posted on Feb 05, 2008

MNTECH
  • 1543 Answers

SOURCE: dehumidifier

Most dehumidifiers these days have a built in defrost control, which turns the compressor off when the coils frost up while the fan continues to blow to help melt the frost off, so if it is frosting you may need a new defrost control, but first check the following: If your model has an air filter, clean it, as restriction of air flow will contribute to icing. Try to move the unit to a warmer location. Usually the best way to do this is to get it above the floor as far as possible, as the air temp is warmer closer to the ceiling than it is at the floor. Make sure there is plenty of room for air to circulate. (don't push it against a wall)

Posted on Sep 15, 2008

  • 72 Answers

SOURCE: Electrohome dehumidifier stopped working

I have no experience of your particular machine but I have some experience of my Wood's DS-15, another fine machine of the compressor type that is built to last. They should be rather similar in design.

My first thought when I read your problem description is that you have a severe buildup of dust inside the machine. On the Wood's, you loosen the front grill and behind it you will see the fan, behind the fan is the condenser pack, and then you get to the evaporator coils that are visible from the back of the machine.

Maybe the configuration is slightly different on your machine but they are built very simple these machines, easy to see what they need in order to work as designed and you already know the most central and expensive parts seem ok.

I had some problems with low efficiency on the unit after six years daily service in a laundry room for drying clothes, took it apart and couldn't believe the amount of dust that was packed into the fine fins of the condenser on its back side! Also extremely much dust on most components like the fan.

I just took it outside and blew it clean from the front side with compressed air, problem solved and machine performance went back up to where it was when new!

I would imagine after a few more years of dust buildup inside, at one point or another the dust will reach the fan and prevent it from spinning. It is also possible of course that the fan motor is shot but I'd start with a really good cleaning.

If that doesn't help I'd continue with the multimeter see if the humidistat gives power to the fan and compressor when it should, if the fan actually spins when powered, if the switches work. It should be quite easy to track down the reason the fan doesn't spin, IMO. I believe you can buy replacement humidistats and motors if they turn out to be faulty.

Good luck!


Posted on May 26, 2009

  • 1 Answer

SOURCE: Dehumidifier Freezing up

Your dehumidifiers are LOW on freon. Over time, small leaks will occur and the coils will freeze. Take your units to a qualified repair shop (central air, or furnace) and recharge the freon.

Posted on Jun 05, 2009

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I thought the freezing up issue was resolved post cleaning of filter (didn't know there was one). Now, it will begin to run but shut off...the compressor doesn't seem to engage. How may I re


Glad to hear that cleaning the filter got us to the next step-- Congrats on the progress!
Now Tell me more about what you mean by: ..." THe compressor doesn't seem to engage."
If you can reach the compressor piping, you can tell if the compressor is 'engaging' - by noticing a drastic difference in temperature -- the outlet pipe-- usually near the top of the compressor can-- / -- and the inlet pipr -- usually further down the side or near the bottom of the compressor.
THe Discharge pipe can get VERY HOT at the top, and the Suction pipe at the lower level can get VERY COLD (likely close to freezing) at the inlet-- the lower pipe.
Be very careful!!, if the compressor has been running a few minutes-- as the outlet pipe can burn your fingers!
Anyway-- if you notice a great difference in temperature, while the compressor is running, you know that it is moving gasses thru the system-- and thus should be creating the condensing surfaces needed to cause water to be removed from the air flowing thru the coils.
Please check this, and let us know what you learn.-- then maybe we need to dig deeper--- Like where is a frost (or sweat) line appearing, -- and more about air flowing details.
Hope this was helpful- MB


Sep 03, 2012 | Comfort-Aire BHD-301 Dehumidifier

1 Answer

Kenmore dehumidifier compressor on but doesn't collect water


clean the condenser in the front or the filter if it has one. no air flow to cool it down will result in overheating and no condensation collection across the evaporator coil.

May 09, 2012 | Kenmore Dehumidifiers

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Fan runs but compressor doesn't kick in


Bad capacitor or compressor

Mar 28, 2012 | Dehumidifiers

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Everything works, except the appliance doesn't absorb nor eliminate the humidity; the pan doesn't fill up and the hose doesn't spew out any water. The electronics seem fine in that the power...


As I tell all the folks who report the same problem you have. There are 5 basic, but solvable reasons for what you described. Please pay particular attention to numbers 1 and 2.

1. The humidity extraction level is set to HIGH. Lower it to 32-35%.

2. Air intake filter is dirty or clogged. Turn unit OFF, & Unplug the
Unit, before removing to inspect & clean it, if necessary. If washed,
allow filter to completely dry before reinstalling. DO NOT operate
the unit without the filter.

3. Obstructed air flow. Maintain a minimum of 12 to 18" of clear air
space around the entire unit.

4. Cooling coils are dirty and need to be cleaned. Use warm water & dish washing liquid to
clean the coils. Rinse and wipe dry. Apply a light coating of WD40 to the coils.

5. Ambient air temperature at floor level is between 40 - 60 degrees.
dehumidifiers do not work well between those temperatures
(Unless, you have a Low Temp Unit). This applies mainly to
where the air temperature at floor level is colder than at shoulder
in basement applications level. Raising the unit up off the floor,
onto a sturdy table, counter top, etc, that can handle the weight
of the unit, plus a full tank of water, will usually resolve this
problem.

If none of the above solves the problem, it may be a case of the compressor needs to be recharged with refrigerant gas or that the humidity condenser sensor has failed. These things usually occur in units that are 5 years old or older. It's rare in a unit younger than that. But, it can happen.

I hope this helped you to troubleshoot and solve the problem. Please let me know. Thanks.

Jun 24, 2011 | Kenmore Dehumidifiers

1 Answer

At this time every year I turn on my Fedders A7DH45B2A Dehumidifier in my finished basement. I turned it on the other day and it will not extract water. I have a humidity meter in one bedroom it is 67%. I...


Bob, the unit may not need to be recharged. I may simply be a matter of the humidity extraction level on the unit is set to high. Try lowering the extraction level to 35% or if your dehumidifier doesn't have a LED screen, set to maximum. In addition, be sure that the unit has at least a minimum of 12" clear air space all around the unit.

As far as recharging is concerned, it's like recharging the air conditioner on your car. But, in this case, your mechanic can't or won't recharge the dehumidifier. So before any recharging is done, I would like you to do this in home test.

Move the dehumidifier to the bathroom. Turn the shower on hot enough to generate steam. Do non turn on the bathroom's exhaust fan and close any open window(s) in the bathroom, Turn the dehumidifier ON and set the extraction level at 35%. As you exit the bathroom, close the door. Wait at least 15 to 20 minutes before returning to the bathroom. Ten turn the shower OFF and allow the unit to run an additional 5 minutes. Then check the water collection bucket for water. If you find any, the unit is working as it should. In which case, the humidity extraction level was originally set to high. If there are no signs of water, then the unit needs to be recharged with refrigerant. At that time, if there is a leak, it will be detected. As far as the cost of servicing and recharging is concerned, depending on where you live, it could be up to $100.00 or less.

Hope this helped you troubleshoot and solve the problem. Please let me know. Thanks.

Jun 04, 2011 | Fedders A7DH45B2A Dehumidifier

1 Answer

I have a Danby Silhouette and the fan works but the dehumidifier doesnt.


Bryan, it may imply be a case of the humidity extraction level being set to high. Lower the level to 35% and see what happens. As far as the fan running is concerned. Most dehumidifiers are designed for the fan to run, even if the compressor doesn't turn ON. It's designed to keep the air circulating and if the humidity rises above the setting you have it on, the humidity sensor will pick up this change and turn the compressor ON.

Also, remove the air intake filter to see if it's clogged and needs cleaning. Maintain at least a minimum of 12" of free air space all around the dehumidifier. Poor air circulation will prevent the unit from working properly. As will, to low an ambient air tempeature. Most unit struggle to work at temperature between 40 & 60 degrees F.

Hope this helped you to troubleshoot and solve the problem. Please let me know. Thanks.

Jun 04, 2011 | Danby DDR451 Dehumidifier

1 Answer

Compressor seems to be overheating although top is cool. Continues to run but doesn't collect water. Fan is working. Can't locate model number.


If the compressor motor is overheating, it's usually a result of low refrigerant gas in the cooling coils. Recharging is an option, if you can find a shop that will do it.

May 22, 2011 | Kenmore 54501 Dehumidifier

1 Answer

My dehumidifier compressor runs and then shuts off, then runs and shuts off, continuously. The fan continues to run. It seems to be pulling water, though it's hard to tell how much because I have a...


Part of the problem may be that you have the humidity level set to high. The fan runs constantly to move the air around. When the unit senses a humidity level higher than what you have it set for, the compressor turns ON. Once it's ON, if the humidity level is short lived, it turns OFF.

Try setting the humidity level to the lowest possible setting. Usually, that 45%. If the humidity level in you home is higher than that, the compressor should turn ON and run until either the bucket is full or the humidity level reaches 45%. If this doesn't solve the problem, turn the Master ON/OFF Switch to OFF and unplug the unit from the wall outlet for 12-15 minutes. Plug the unit bakc in, turn the Master ON/OFF Switch to ON and set the humidity level at it's lowest setting. Allow the unit to run until it cuts OFF and check the bucket for water. Hopefully that 12-15 minute time out allowed the unit to reset itself.

Hope this helped you to troubleshoot and solve the problem. Please let me know. Thanks.

May 11, 2011 | Maytag M3DH30B2A Dehumidifier

1 Answer

The dehumidifier runs, cycles on and off, but there is almost no water in the receptacle. I haven't had to empty it since it started cycling on & off this season. I usually have to empty it at...


You may have the humidity setting to high. Try lowering it to 45%. Or if yours doesn't have an LED Screen, set it for minimum. Also, check and clean the air intake filter, if you haven't already. Keep in mind, most dehumidifiers have a fan that may seem to run constantly, but the compressor doesn't turn ON. The fan is circulating air, in a effort to detect humidity levels that are higher than what you have the humidity removal set on.

Hope this helped you.

May 10, 2011 | LG LHD45EL Dehumidifier

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