Vaillant Silent Brine Draw Failure

Softener does not draw brine during regeneration but no error code is shown

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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

Partially blocked injector, Air leak on brine line, Brine level too low, Brine valve not opening fully

How to Fix / Troubleshooting

Safety: Isolate power and water before opening the injector housing.

Steps:

  • Observe brine draw: During the brine draw phase, mark the brine level and check after 10–15 minutes. If the level does not drop, proceed with checks.
  • Clean injector: Remove and clean the venturi injector and associated screens.
  • Check for air leaks: Ensure all brine line connections are tight and that the line is fully submerged in brine.
  • Inspect brine valve: Check that the brine valve actuates correctly during regeneration. Replace the valve cartridge if it sticks.
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Repair Difficulty

Medium 3/5

Required Part

Venturi Injector and Brine Valve
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