E05
Watersoft
Brine Refill Solenoid / Valve Fault
E05 displayed and unit fails to refill brine tank after regeneration
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Safety Warning
This repair may involve working with high voltage components or water connections. Always unplug the appliance before removing any panels.
If you are not confident in your ability to perform this repair safely, we strongly recommend contacting a professional technician.
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Possible Causes
Clogged brine refill orifice, Failed brine refill solenoid or valve in Watersoft head, Blocked refill line to brine tank, Control board not energizing refill circuit
How to Fix / Troubleshooting
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.
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Repair Difficulty
Medium
3/5
Required Part
Watersoft Brine Refill Valve
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