Tip & How-To about Dehumidifiers

Meaco dd8l fault light.

Not long after my unit ran out of warranty it developed a fault. Less then a minute of being turned on the double fan light would begin to flash and the unit would shut down. The filters were regularly maintained as recommended my the manufacturer. I am not one for just throwing it out and buying a new one, so I stripped it down.
i noticed the dissident wheel was not turning so I removed the motor, stripped it down and re greased the plastic gears within. Then I noticed the dissident wheel itself was catching on something (motor still removed) when I manually turned it. After taking the dissident wheel off I could clearly see the plastic housing behind the wheel was melted and snagging the metal 'spokes' on the dissident wheel. The area is located directly behind the heater unit.
after flattening the plastic down smooth, the unit is now working.

I have concluded the reason this may have happened is the unit being switched off before its shut down process had finished, meaning the metal 'spoke' was stopped next to the plastic with the heater still hot enough to heat the spoke enough to melt the plastic behind causing a snag for the wheel.

so I think the shut down procedure is quite important before turning it off at the wall.

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1 Answer

Will turn on but no dehumidifying so there is no water in the bucket.

well 67%rh is considered low (70%rh is normal) units will produce much less water when tasked to operate in low moisture air , this is why all the new units have air temp ratings of 60Deg or less. but still the unit should try to go thru all the motions ,that you can easy verify , just by u watching /listening closely
set unit to work normally , listen 4 the fans inside to come on and a few moments later the compressor will come on if everything is working well , try adjusting the humidistat up to a value of say 80% listen 4 one fan and compressor to stop , this is all normal reset desired setting on humidistat
if unit fails any one of these simple tests it has an internal fault inside it and requires service

Oct 30, 2015 | Dehumidifiers

1 Answer

my dehumidifier runs but takes no moisture out of the air

wow I get this question A lot ... things to ck first
1- control setting = less than room measurement for humidity , if your unit does not tell you rooms rh% consider buying a external %rh meter that you can place elsewhere in room there not that expensive to buy
2 unit working properly ? look for bucket full lights (it doesn't allways mean bucket is full) fault light or codes ? filters clean and new looking ?
3 if unit sounds if its running did you know that most dehumidifiers nowdays have two fans in them , could be you hear one running and not the other , this will prevent the unit from working correctly and some units don't let you know theres a fault with it (poorly designed my opinion ) , use a flashlight give it a good lookover you'd be surprised what you can find with one of those

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1 Answer

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if the red light is flashing this means theres a fault , most common fault on these are water catch bucket is full or not seated back correctly

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1 Answer

Error code 67

Error code 67 is an airflow problem. Either clogged filter or bad blower motor. Unplug unit remove bucket and feel for filter in front behind cover it drops down. Clean filter with water and reinsert. Plug unit in turn to "on", fan should begin to run, after 3-5 minutes compressor should start. If fan does not start it is bad and should be replaced.

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1 Answer

i have a whirlpool dehumidifier (AD75UST0) and it appears to be 'dead'. is there a fuse or a reset?

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I am going to try a replacement Fan and fan start Capacitor (always replace in pairs).

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