Question about Maytag M7DH45B2A Dehumidifier

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Unit fan is running but the compressor is not.

Unit has been working fine for several years. Humidity is 75 setting is 60, but the compressor will not come on. When I shut it off for several minutes, then restart it, the compressor comes on for a short period. Then just the fan runs.

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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

Posted on May 04, 2010

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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.

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could you be mistaking the room humidity indicator for the time? reason I ask is on these one display units this happens more frequently than Id care it too , the one display shows both time and room humidity also set point humidity , the only way one can tell is on some models there is a tiny light that shows up next to labeled function , easy to miss It , also if your machine is sort of new (last few years) it has been decided that it's more efficient to let the circulation fan run all the time , regardless of room humidity . this makes it a little annoying (noise) but they do cycle the compressor to regulate the room humidity

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Will not regulate humidity correctly. I set it at 60% and it is still running when the humidity in room reads 45%. I have confirmed this with a separate humidity gauge.


It may just be the fan running and not the compressor. Some unit's are designed that way, so that air is constantly moving and when the humidity level rises above what you have it set on, the compressor will automatically turn ON and remove that moisture. Wants it's back to where you have its set, the compressor will turn OFF. Check your Owner's Manual to see if your model has that feature.

Hope this helped you and thanks for choosing FixYa.

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I have the a Kenmore dehumidifier sometimes it runs fine and other times just the fan runs not the compressor or just the opposite the compressor runs not the fan it is only 2 1/2 years old. What should...


Kathy, I'm not sure you have a problem with the dehumidifier. Depending on which mode you're operating it in, the fan will run in an effort to recirculate the air. If the humidity level rises above the level you have the unit set on, the compressor will then turn ON. This is particularly true, if the unit is operating in continual mode. Then there are other times the fan isn't active, but the compressor turns on when the humidity sensor feels a rise in humidity. So, for the most part, I don't think it's a problem.

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There is some service that you can do ... Clean the filter and the cooling coils, regularly. Check the humidity level that you have the unit set on. It may be set to low and there's just not that much humidity in the air at this time, for it to collect. From what you said, it sounds like you may have it set on continuous cycle which could account for the lack of a lot of water in the bucket. In continuous run, the fan stays ON all the time. It's supposed to do that, so that the air is constantly moving and the sensor only turns the compressor ON, if it senses a humidity level 5% higher than what you have it set for. Try running the unit on a 1 or 2 hour cycle (if your model will do that) rather than continuous cycle.

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Hi;
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