E12 error and display shows abnormal temperature or shuts down in hot locations

Safety first: Disconnect power before relocating or opening the unit.

• Check installation environment: Verify the Watersoft softener is not installed in direct sunlight, near a furnace, or in a confined unventilated closet. Ambient temperature should be within the manufacturer’s specified range.
• Improve ventilation: Ensure there is at least several inches of clearance around the control head. Remove any covers or insulation that block airflow.
• Inspect for dust and debris: Gently clean dust from the control board and housing with a dry brush or compressed air to improve heat dissipation.
• Sensor check: If accessible, locate the temperature sensor on the board and verify its connector is secure. A failed sensor may falsely report over-temperature and require board replacement.

If E12 persists in a proper environment, the control board is likely defective and should be replaced.