Question about DeLonghi DH90U Dehumidifier

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Fan works, cooling element works too enthusiastically forming ice in cooling grillage, could this be the thermostat that is faulty. It simply freezes up with no condenstion of water occuring?

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Icing is caused by one of two things .. if the air flow is restricted .. or if the unit is low on refrigerant .. the air flow is frequently restricted by dust accumulation in the evaporator coil (where the ice is forming) .. if that the case you can check with a flashlight and wash or vacuum out any accumulation .. . the fan could be running slow due to a lack of lube in its bearings or something might be blocking air flow .. when you first turn it on check for good air flow .. if that is ok then suspect the low refrigerant level ... what happens is that if the correct amount of fluid is in the system then the entire evaporator gets evenly cool but not excessively so .. but if the fluid is a little low then one small section of the evaporator gets very cold .. that freezes and that, in turn, blocks air flow so the freezing process progresses across the entire evaporator until its hopelessly clogged with ice .. you must thaw it out by turning it off for a day or so .. the refrigerant fluid systems in most of these are sealed .. so you don't really have any way of adding more fluid .. a repair person will add a special "saddle valve" that pierces the metal tubing .. that allows recharging the system .. he would also check for leaks .. there is one, or the level would not be low .. sometimes its such a small leak that a charge will last for years and you don't have to worry about it .. the repair person would use a soap/water solution to check for bubbles..or he could use a "sniffer" (a tool that detects leaks) when he finds the leak then he would repair it by braising or epoxy or other patch method .. you would want to get an estimate before repairs because sometimes it cost more to repair than to replace the unit .. thats a shame but thats the way things are now ..

Posted on Oct 09, 2010

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1 Answer

Dehumidifier


when ice forms on an evaporator unit (coil) there is an indication of internal problems with the unit. IT may occur if there is insufficient air flow ( dirty or fan speed to low ) but when this happens the thermostat just orders more gas through the tx valve and so more ice is formed then the thermostat reads it as too cold and so cuts the gas flow back by controlling the operation of the tx valve
Water from a dehumidifier will depend on the atmosphere humidity so the lower the humidity reading the less water collected
However I suggest that you have a technician check it out as the compressor start/run capacitor may be faulty and that is why the compressor is not getting hot as it may not be running properly

Jul 23, 2015 | Dehumidifiers

1 Answer

Ice forms on the coils. Would wet clothing hung in the area contribute to this problem? The temperature of the area is in the high 50's - 60's.


Yes. Wet clothing would act to put Humidity in the air. think of the air as a sponge the more you heat the air the more the air will take moisture out of its surrondings. The more you cool the air the less moisture it can hold.
a Dehumidifier is a reverse refrigrator.. Air is forced over cool coils and the moisture forms and freezes on the coils (ice). The unit turns off and the coil and ice takes heat up from the surrounding area (makes room colder;Clothing takes longer to dry; The temperature in that room should be were people reside 70-80 degrees). the ice melts and water drips into a holding container which you dump periodically. Solution: 1. remove wet clothing or 2. raise temperature in room. 3. put a space heater in that room instead of Dehumidifier

Nov 29, 2010 | Dehumidifiers

1 Answer

The coils freeze up after less than a half hour of running. It does not matter what humidity setting I use or if I select the 2 hour or 4 hour run cycle. B/c the coils are freezing up, the dehumidifier...


the coils freeze up for one of two reasons .. if air flow is blocked .. sometimes by dust buildup or fan bearings needing lube .. second if the fan is working properly then ice buildup can be caused by low refrigerant levels .. the proper charge produces a steady coolness across the entire evaporator (cold coil) .. as the level drops it tends to cool a small part of the evaporator way too cold .. that creates ice .. the ice blocks the air flow and soon the whole thing is blocked ...so check the fan first .. if its running properly and there is nothing blocking air flow then suspect low refrigerant.. that requires adding a saddle valve service port to the system to allow adding refrigerant .. often the problem is caused by the fan not working at all because of lack of lube in the bearings or a bad starting capacitor ..

Aug 15, 2010 | Goldstar DH504EL Dehumidifier

1 Answer

Ice started forming on top of unit and now it has shut off and won't restart. It hasn't been running efficiently for past few weeks. Can I fix it?


If the surrounding temperature is low enough the condensing elements of a dehumidifier ice up just like the cooling plates in a frig. Either reduce the power or raise the surrounding air temperature.

Jun 14, 2010 | LG LHD65EBL Dehumidifier

1 Answer

The dehumidifier freezes and ice forms on the filter in the back. It keeps running.


You are working it too hard. Back off the percentage. But first, let it thaw. Id be inclined to use a fan in the area. You might need two machnes in this space. Do not allow outside air into the space until you get it a little more dried out.

I hope this works for you

a

Sep 30, 2009 | Kenmore Dehumidifiers

1 Answer

Dehumidifier freezes up


Most dehumidifiers need warmer air to work properly. The temperature in a basement is usually 60 - 65F; too cool for standard models. You could buy a "basement" dehumidifier. They're designed to work at lower temperatures; some as low as 40 F. Costs are about the same as a standard dehumidifier; you just have to find it.

For a cheap fix, try this; it seems to be working for me.

Since the condensate coil (the one icing up) is cold, the air entering it is too cool and the condensate frosts up the coil. Additional condensate freezes to the frost and before you know it, you've got a block of ice. Since the air coming out of the front is very warm take a large piece of cardboard around 6' x 3') and form a V. Placed it in front of the dehumidifier so it channels some of the warm air back to the rear where it warms the moist air up before it hits the cooling fins. It's helped keep the ice down.

If you want something attractive, any screen that redirects some of the air back to the rear will work. Just leave the top open so it doesn't get too hot and the some of the drier air gets out into the room.

Jul 02, 2008 | GE AHG40LJ Dehumidifier

1 Answer

Ice on dehumidifier


A dehumidifier works by cooling the metal pipes on the back of the unit to create condensation (water vapor in the air). This then drips into the collector bucket. If the unit runs too long the cooling tubes can get too cold and freeze the condesing water vapor. Unplug the dehumidifier and let the ice melt, when u turn it back on, turn it down, it may be up too high. If you find this solution helpful please rate it.

Thanks - Tech101

May 20, 2008 | LG DH404E Dehumidifier

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