Display shows E12 and the unit indicates a temperature sensor or over-temperature fault (on models with temperature monitoring).

Safety: Unplug the unit before removing covers. Do not run extremely hot water through the softener.

Steps to address E12 (Temperature Sensor Fault):

• 1. Check water temperature: Measure the temperature of water entering the softener. Ensure it is within SpringWell's specified range (typically cold to lukewarm; not hot).
• 2. Inspect sensor wiring: Locate the temperature sensor (often clipped to the valve body or integrated into the control head). Ensure the wiring harness is intact and firmly connected.
• 3. Allow cooling time: If hot water has accidentally been run through the softener, allow the system to cool to room temperature, then clear the error and monitor.
• 4. Replace sensor: If wiring is good and water temperature is normal, replace the SpringWell temperature sensor if it is a separate component.
• 5. Replace control head: If the sensor is integrated and not replaceable, or if a new sensor does not resolve E12, replace the SpringWell electronic control head.