BWT Internal or External Bypass / Cross-Connection

BWT softener causes cross-connection of hard and soft water (mixed hardness at outlets)

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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

Incorrect plumbing connections (inlet/outlet reversed), External bypass piping allowing mixing, Internal valve seal failure causing bypass

How to Fix / Troubleshooting

Safety first: Shut off water before altering plumbing. If unsure, hire a licensed plumber.

  • Verify plumbing: Check that the hard water inlet is connected to the BWT inlet and the softened outlet to the house. Reverse if installed incorrectly.
  • Inspect external bypass: Ensure any external bypass loop is fully closed when softening is desired.
  • Test hardness: Measure hardness at inlet and outlet to confirm mixing.
  • Check internal seals: If plumbing is correct but mixing persists, internal valve seals may be leaking and require replacement.

Complex cross-connection issues should be resolved by a professional to avoid contamination risks.

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Repair Difficulty

Hard 4/5

Required Part

BWT valve seal kit
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