E05 displayed and unit fails to refill brine tank after regeneration

Safety first: Unplug the unit and place it in bypass. Relieve pressure before opening the valve head.

• Check brine tank water level: After a regeneration, the brine tank should have a small amount of water. If it is completely dry, E05 is consistent with no refill.
• Inspect refill line: Follow the small tubing from the valve head to the brine tank. Look for kinks, pinched sections, or blockages at the air check or safety float assembly. Clear or replace tubing as needed.
• Clean refill orifice: Remove the brine refill orifice or flow control from the Watersoft valve. Soak in vinegar to dissolve mineral buildup, then rinse and reinstall.
• Test solenoid/valve: Restore power and initiate a manual regeneration. During the brine refill step, listen for a click at the refill solenoid and feel for vibration. If there is no sound or flow, test the solenoid coil with a multimeter and replace the brine refill valve if open or shorted.
• Control output check: If the solenoid is good but never energizes, the main control board may not be sending power. This typically requires board replacement or professional diagnosis.

After repair, manually add water to the brine tank to the recommended level and run a full regeneration to restore softening capacity.