In both cases, the only fix is to replace the motor entirely – do not attempt to fix it.Thanks for your quick response. When a fan motor is damaged, it will often make a high pitched noise indicating mechanical failure and/or a burned electrical smell indicating a short inside the unit. If neither the humidistat nor the fan are damaged, then the issue may be a faulty or dying fan motor. If not, then take the time to carefully clean them. If wheel or blades appear to be damaged, you’ll want to replace them.
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Then, check the fan blade/blower wheel to make sure that there’s nothing preventing free movement. Take the time to clean off any dirt/debris on the blades that could be preventing air flow. If you’ve cleaned/replaced the air filter, but there is no air flowing through the grill, you should remove the fan cover to inspect the coils. These parts control the flow of air through the unit that is required to prevent the condenser coils from freezing up. If the humidistat is not the issue, then you may have a problem with your blower wheel/fan blade. If they do not, you need to replace the humidistat. When you rotate the control, the contacts need to at some point make an open circuit (no current flowing). In addition, you can test for a short in your humidistat using a multi-meter. Then, turn your humidistat dial and listen for the clicking noise that indicates it is functioning properly. In order to troubleshoot your humidistat, you’ll want to first disconnect the power to your unit. In addition, the electrical contacts in a humidistat can get deformed or covered with a conductive layer of dust, which leads to the same issue.
If the humidistat is not functioning properly, your compressor stays on too long and causes the coils to freeze. The electrical contacts of a humidistat cause the compressor of your dehumidifier to turn off and on. If your dehumidifier coils are freezing while room temperature is higher than 65°, then you may have a problem with the unit’s humidity control unit, also known as a humidistat.Ī humidistat is a lot like a thermostat, in that it constantly monitors the level of humidity in the room so the unit can turn itself on and off to maintain a set level in the room. The most common culprits include: Humidistat There are several things that you can do to keep your dehumidifier from freezing up-and to defrost it if it does. If air flow is restricted, then the motor & compressor unit will have to work much harder and could get overwhelmed and burn out. If you keep using it while the coils are frozen you will cause further damage. If you have a dehumidifier that is icing up, the first thing to do is to stop using it. Then, you can clean the part or replace it as needed before it does harm. If you regularly clean and maintain your unit, you’ll find these issues quickly. If your fan is not functioning well or the condenser coils are clogged with dust, air cannot flow through the unit quickly enough to cool and remove excess humidity. Air flowĪnother reason your dehumidifier could freeze up is a restricted flow of air through the unit. This works quite well when the temperature is high, but if it gets too cold, the water vapor will freeze instead of condense, which causes problems. As it travels through, the cold metal coils cause the water in the air to condense and drop into a collection reservoir or pumped out through a hose. The air is pulled into the unit through a vent. However, if the air temperature drops lower than that, the unit may freeze up and quit working. Most units will work perfectly fine in a room that is 65° F or more. One of the most common causes of a dehumidifier freezing up is the temperature of the room that it is located in.
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