Vaillant Brine Line / Fitting Leak

Water leaking from brine line connections or around the brine well

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Possible Causes

Loose compression fittings, Cracked brine tubing, Damaged brine well grommet, Overfilled brine tank causing overflow at fittings

How to Fix / Troubleshooting

Safety: Disconnect power. Brine is corrosive; protect nearby metal surfaces and electrical equipment.

Steps:

  • Tighten fittings: Gently tighten compression nuts on the brine line. Do not overtighten plastic fittings.
  • Inspect tubing: Check the entire length of the brine hose for cracks or pinholes. Replace with compatible brine‑resistant tubing if damaged.
  • Check brine well seal: Ensure the brine well cap and grommet are seated correctly and not split.
  • Correct overfill: If the tank is overfilled, remove excess brine and resolve the underlying overfill cause (see overfill fault).
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Repair Difficulty

Easy 2/5

Required Part

Brine Line Tubing and Fittings
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