The answer to 'why is my water softener frozen' is that a water softener can freeze if it is exposed to cold temperatures, usually below freezing (32°F/0°C). This can happen if the softener is located in an unheated area like a garage, basement, or crawl space. When the water inside the softener tank freezes, it can cause damage to the internal components and prevent the softener from functioning properly.
Some common signs of a frozen water softener include reduced or no water flow, the softener not regenerating, and the tank feeling cold to the touch. To prevent freezing, the water softener should be located in a heated area or insulated. If the softener does freeze, it's best to call a professional plumber to inspect it and make any necessary repairs.