Question about DeLonghi DH90U Dehumidifier
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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Posted on Jan 02, 2017
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