The answer to 'why is my dehumidifier freezing up' is that a dehumidifier can freeze up due to a few common causes. This happens when the coils inside the unit get too cold, causing condensation to freeze. Some common causes include a dirty air filter, low refrigerant levels, or a malfunctioning thermostat or fan.
If your dehumidifier is freezing up, you may notice reduced airflow, ice buildup on the coils, or the unit shutting off unexpectedly. To fix the issue, you can try cleaning the air filter, checking the refrigerant levels, or adjusting the thermostat. However, if the problem persists, it's best to call a professional HVAC technician to diagnose and repair the issue.