Pentair Bypass Valve Failure

Softener is stuck in bypass; moving the bypass handles does not restore service flow.

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.

Possible Causes

Broken Pentair bypass valve internals, Mineral buildup in bypass, Incorrect installation of bypass, Damaged O-rings in bypass body

Safety: Shut off main water and relieve pressure before removing the bypass assembly.

Verify handle position: Ensure the bypass handles are fully in the SERVICE position per the Pentair markings.
Inspect bypass: Remove the bypass from the control valve. Check for broken internal parts or heavy scale.
Replace O-rings: Install new Pentair bypass O-ring kit if seals are damaged or flattened.
Bypass replacement: If the internal mechanism is broken, replace the entire Pentair bypass valve assembly.

Medium 3/5

Pentair bypass valve assembly

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