North Star Partial Bypass / Plumbing Cross-Connection

Softener installed but water is still hard at some fixtures only

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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

Some fixtures plumbed before softener, Bypass valve partially open, Incorrect inlet/outlet connections, Mixing valve cross-connection

How to Fix / Troubleshooting

Safety: Turn off water before altering plumbing. If unsure, consult a licensed plumber.

  • 1. Map plumbing: Identify which fixtures receive hard water. Check if they are connected upstream of the softener.
  • 2. Verify inlet/outlet: Confirm the softener inlet is connected to the main supply and the outlet to the house distribution, not reversed.
  • 3. Check bypass: Ensure the bypass valve is fully in service and any additional bypass piping is closed.
  • 4. Correct cross-connections: If mixing valves or loops are feeding hard water into softened lines, re-pipe as needed.
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Repair Difficulty

Medium 3/5
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