A visibly clean air filter is a good sign of a broken fan motor as there is no air flowing through the grille. Additionally, dust, dirt, or debris could also impede the fan from spinning smoothly. This could result in broken or loose fan blades that further restrict the airflow output. A dirty filter clogged with dust, hair, and dirt can result in a frosted dehumidifier due to restricted air circulation.
An air filter is there to trap dust particles in the air and protect the internal components. A poorly maintained filter could limit the airflow that pushes through thus continue to cause issues to the dehumidifier. Dirty deposits on the evaporator and condenser coils can cause a dehumidifier to ice up because the air cannot circulate properly.
Over time, dust, dirt, hair, lint that bypassed the filter will accumulate and occupy the coils space. Air inlet or outlet blockage could also restrict airflow circulation and causes the dehumidifier to ice up. This usually happens when a dehumidifier is placed too close to the wall or there are foreign objects obstructing the ventilation.
A dehumidifier should not be operated when the coils are totally frosted over. This condition can lead to permanent damage of the compressor the heart of the unit in most cases making it uneconomical to repair.
Some dehumidifier models have a built in 'de-ice' control which will shut the compressor down when frosted over before damage can occur to the compressor. While this may still produce some recovered moisture when the compressor shuts off the frost will melt and drip down it will not dehumidify as well as intended.
If your room requires dehumidification but a standard dehumidifier in proper working order has a tendency to frost over, a "basement dehumidifier" model may be able to be used instead of a regular model to achieve proper and consistent humidity control. Identifying a refrigeration system problem A problem with the refrigeration system of a dehumidifier can usually be identified by a partially frosted evaporator coil which would usually indicate being short of refrigerant or a failing compressor.
If the evaporator is not getting cold at all when the compressor is running , that is a sign of being totally out or refrigerant or of a faulty compressor. Compressor not running If the compressor totally fails to run, no cooling and hence no sweating nor frosting of the evaporator coil can take place.
The fix is easy. Turn the machine off and let it thaw out. Another thing that can cause your dehumidifier to freeze up is a blockage that is not allowing your air to flow freely across the refrigeration coils. In other words you have something either clogging up your filter or you have the unit too close to the wall where the air cannot enter and exit easily. In some instances you may have debris actually get inside the machine and and prohibit the air from flowing through it.
If the air that is over the refrigeration coils is not allowed to flow freely it will eventually freeze. The fix for this is easy also. Clean the filter. Make sure the placement of the machine is not in an area where air cannot Flow in and out freely.
And open it up to make sure that there is no trash or debris inside that could cause the air to be slowed. Even though most problems with dehumidifiers and air conditioners freezing can be solved very easily using the methods we stated above, there are also going to be times when the problem is mechanical.
The humidistat on a dehumidifier is basically the thermostat that tells the machine when to turn on and turn off based on the temperature in the room. If the temperature in the room drops too much and the humidistat does not communicate with the machine to tell it to turn off then the machine will continue running when the air in the room is too cold and the refrigeration coils will freeze over.
The fix for this is not going to be as easy. And the part itself is held on by a couple of screws usually. Another mechanical problem that can happen that would cause your dehumidifier to freeze over is the malfunctioning of the fan. Related to the airflow being prohibited when you have a blockage is the function of the fan moving air through the machine evenly and often. If the fan is not working then the air will not flow through the machine as designed and can end up lingering over the freezing refrigerated coils too long and cause your unit to freeze over.
The fix for replacing a fan or fan motor is the most difficult thing to fix when your dehumidifier is freezing over. It is recommended that you call a technician to check and replace the fan motor if needed.
Depending on the price that you paid for the dehumidifier and the price of the part and the cost of the service, you might be looking at the cost of a new dehumidifier as well.
And easy enough fix. Turn it off and let it thaw.
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