AquaUnique Internal Bypass or Valve Leak

Softener or resin tank emits a constant hissing or whistling sound during normal service

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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 open bypass valve, Worn main seals in control valve, Small leak through drain port, High differential pressure across valve

How to Fix / Troubleshooting

Safety first: Hissing may indicate high-velocity flow. Do not disassemble the valve under pressure.

Step-by-step:

  • Check bypass position: Ensure the AquaUnique bypass is fully in SERVICE and not partially between positions.
  • Listen at drain: Check if water is trickling from the drain line during service. If so, the valve may be leaking internally.
  • Regenerate: Run a full regeneration to flush debris that may be holding a seal open.

When to call a technician: Persistent hissing with drain flow usually requires replacement of the seal and spacer kit or the entire control valve.

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Repair Difficulty

Medium 3/5

Required Part

AquaUnique Seal and Spacer Kit
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