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Diagnosis of electronics in an LG dehumidifier


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#1 RichieP

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Posted 26 July 2013 - 08:56 PM

Greetings, experts,

 

I have a model LHD30 dehumidifier that is about 6 years old. The last time I turned it on, nothing worked. No signs of life. The only light on the unit is the one that tells when the bucket is full. Previously, like a week ago, it was working great. At this time there is power to the common side of the compressor and to the printed circuit board. Also, about 18VAC at the transformer secondary. The range of resistance of the potentiometer that controls humidity level seems OK, though it is even more non-linear than I expected.

My questions are; how do I test the sensor/harness assembly, and, if it tests OK is there anything else other than the control board to replace?

 

This may be a hint - or a red herring. About 3 years ago the dehumidifier suddenly started to run almost continuously. Even when the air in the basement felt very dry and the rate of water accumulation became very slow it would run. What worked to deal with that situation was to set the humidity control just a few degrees of rotation above the 'off' position, for minimum humidity removal. Doing this, the dehumidifier would shut off at what seemed like a good enough level of humidity. Set any higher, it would never shut off. This is where the potentiometer would be approaching zero resistance. My guess was that this was a sign that one of the sensors was out of whack, but still, barely, within functioning range, and now it is completely gone. All that said, I would still like to know how to test these sensors and replace only what is needed.

 

Thanks in advance for your help.

       Rich



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#2 Samurai Appliance Repair Man

Samurai Appliance Repair Man

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Posted 29 July 2013 - 11:19 AM

I can't find any specs on this one but you can at least test the thermistor for open/short.  

 

Here's another way to play it: 

 

Buy both the thermistor and the main PCB.  

 

Replace the thermistor.  If that fixes it, great-- return the main PCB for a refund.  

 

If it doesn't fix it, replace the main PCB.  You could return the thermistor but it's such a low value part you'll spend about as much on return shipping.  

 

Parts links:

 

Main PCB:  http://www.repaircli...delNumber=LHD30

 

Relay-Board-EBR39204301-01298987.jpg

 

 

 

 

Thermistor:  http://www.repaircli...delNumber=LHD30

 

Thermistor-6877A30013V-01074794.jpg



#3 PDuff

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Posted 29 July 2013 - 11:44 AM

Concur with Master Samurai, Brother Richie.  No diagnostics on your model.  Almost everytime I think it's just a bad sensor, it turns out to a bad pcb.  Replace both if feasible.






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