The answer to 'dehumidifier freezing up' is that a dehumidifier can freeze up for several common reasons, including low room temperature, a dirty air filter, or a refrigerant leak. This causes the coils to become too cold, leading to frost and ice buildup that blocks airflow and reduces the dehumidifier's efficiency.
Some key signs of a frozen dehumidifier include reduced moisture removal, the unit running constantly, and visible ice on the coils or inside the unit. To fix a frozen dehumidifier, you'll need to identify and address the root cause, which may require cleaning the filter, adjusting the temperature, or calling in a professional HVAC technician if there's a refrigerant issue.