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Old 06-10-2009, 08:55 PM   #1 (permalink)
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dehumidifier compressor test

Does anybody know how to test a compressor on a dehumidifier to see if it is burned up or not? My dehumidifier isn't working, and I don't know if the compressor is broke, or something telling the compressor to come on may be broke..

Any help would be great.

Thanks
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Old 06-11-2009, 06:07 PM   #2 (permalink)
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The most common failure mode is for the fan shaft to seize up with crud. Start by freeing, cleaning and lubricating it.
With the case open, you should be able to hear/feel whether the compressor's running. If the hot side's hot and the cold side's cold, that confirms it.
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Old 06-14-2009, 07:53 AM   #3 (permalink)
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Quote:
Originally Posted by drcampbell View Post
The most common failure mode is for the fan shaft to seize up with crud. Start by freeing, cleaning and lubricating it.

I've gotten several "free" dehumidifiers that way. At my local dump they're set aside with the refrigerators and window air conditioners so they can recycle the refrigerant before they get put in with the scrap metal.

If the fan's not turning, the unit freezes up and stops producing water, so folks just toss them. I'll grab a couple that don't look too old or beat up. About 75% of the time, I do what Doug says: give the machine basic maintenance and they're good to go again. I use them in my rental properties and they've run for years after being "resurrected."

Clean the dust outta the coil and oil the fan motor every couple years. Of course, newer models are more efficient and may save me a few bucks a month off my electric bill; but that savings will take a long time to offset the cost of new unit.
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Old 06-15-2009, 02:11 PM   #4 (permalink)
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Thanks ya'll.

Unfortunately there is not temp change in the two sides, so that really leads me to believe the compressor is out. The fan is fine, so looks like I am out of an unit as the compressor is the bulk of the expense...

Thanks again.
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Old 06-15-2009, 03:49 PM   #5 (permalink)
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It could also be that the humidistat, reservoir float switch, compressor overheat/overload switch and/or a loose connection is turning the compressor off.
These components are relatively inexpensive and simple to diagnose & replace. Just look for where there's voltage and where there isn't, starting with the line cord and progressing toward the compressor.
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1986 Isuzu P'up, 177,673.8 miles.
- Hella headlights (highly recommended)
- DOT C-2 back end (also recommended)
- R-12 air conditioner converted to R-406a. Saved ozone and money
- 4.1:1 final drive converted to 3.4:1. Quieter, better mileage but it's a good thing I live in the flat Midwest.
- 9/22/2007, age 21: Still running well when reluctantly sent away for reincarnation, due to body & frame rust.

Last edited by drcampbell; 06-17-2009 at 10:38 AM.
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