AO Smith Partial Regeneration Function

Softener backwashes to drain but does not draw brine or refill properly.

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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 cam installation, Worn seals in specific valve ports, Programming mismatch with valve type, Debris in internal channels

How to Fix / Troubleshooting

Safety first: Unplug the unit and close the inlet valve before valve disassembly.

Observe cycle behavior:

  • Manually step through each regeneration stage (if your model allows) and note which functions work (backwash, brine draw, rinse, refill).

Inspect cam and seals:

  • Remove the drive motor and cam assembly.
  • Verify the cam is correctly oriented and not cracked.
  • Inspect the rotor and seals for localized wear or cuts that could affect certain ports.

Reassemble carefully following AO Smith diagrams. If issues persist, replace the rotor and seal kit and verify that the control is programmed for the correct valve model.

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Repair Difficulty

Professional Required 5/5

Required Part

Control Valve Cam and Rotor
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