Re: Amana 30 (looks like dk25) unit runs but coils freeze...
Most dehumidifiers have a defrost mode in which the compressor is turned off to give time for the frozen water to melt. The freezing problem ocurrs when the unit is used in very cold weather. Check your manual to see if this unit comes with automatic defrost mode. If it does, it would appear that it is not operating correctly and you can request warranty service. If no defrost mode is available, then your only option is to heat up the room in order to use the dehumidifer within its limit of operation. Some units can operate as low as 36 F, but most units cannot go that low. Find out what your unit's specs are from the manufacturers web site.
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if this model doesnt have the removable filter on the middle right side then the filter is not removable by std means and unit will need to be dissasembled for this , Now there are a few reasons for unit to freeze , and yes your right one of them is a dirty air filter . and if its gone too far then a dirty condenser coil as well , also if unit is over three years old then it's possible that due to overheating some of the gas chanrge has gotten out , reducing it's efficency making it run longer with no cool down and freezes up , also if your asking it to remove more water than its designed for (setting to high) it will freeze up as well , std moisture for a home is 70 %rh purchase a small meter to measure this ,(some units have one built in) see how much water you really have ?
coils on these units should not freeze 1st ill bet that production of water removal was not up to par so you turned setting down this makes unit work longer without a rest (cooldown) period (not good) so now the gas charge might be low (from overheating ) and/or filter will require more frequent cleaning
as with any freeze up of any unit (any mfg) there are a few things to look at first before consulting a profesional ,
1st ck your filter most units have a filter these are the most forgoten things when it comes to reg cleaning , remove it and run under tap shake excess water off and replace in unit
2nd is unit warm enoght to work air temp has to excede 68 degrees for these to work
3rd how old is unit if unit is over three years and has been largely neglected for cleaning and maint issues then overheating can cause gas charge to leak out and cause freeze ups , replacement is only option on this reason
4th setting: is unit large enoght to remove water from area if its undersize it runs too hard and never cycles off/on this causes freeze ups , purchase a small humidmeter to measure the area % rh 70%rh is considered normal for a home
The coils should not freeze up. If the fan is working, try lowering the setpoint to just below actual humidity. This will allow the dehumidifier to run and shut so water can drip off without freezing. If that works, slowly lower the setpoint over the next day or so. If the setpoint is too low, the unit runs continuously until it freezes, then never shuts down.
yes cycles should be longer either that or the unit is keeping close to desired humidity. Also the unit is under sized 30 pint is for 400sqft. or 20 by 20 room. humidity should be 30/50 percent check your level desired room temp is 70 degrees but its a basemnt 60 works.
Almost all dehumidifiers now have automatic defrost, but if you are seeing frost is just one small area, it means there is a refrigerant leak. Check your warranty to see if the sealed system is covered longer than one year. Generally, if it is, most manufacturers will replace the unit (rather than repair it, as the repair is rather expensive compared to the cost of a new unit). If you do not have any sealed system warranty coverage left on it, don't fix it. Buy a new dehumidifier.
You can wash the filter with water, no problem. However, I would recommend replacing the filter every 3 to 4 months depending on how much you use the dehumidifier. The exposure to constant moisture will cause the filter to grow mold over time.