Amfa4000 Regeneration Cycle Stalled

Amfa4000 stuck in regeneration and does not return to service mode

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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

Valve drive motor failure, Jammed piston or cam, Control board not advancing cycle, Loss of power mid-cycle causing misalignment

How to Fix / Troubleshooting

Safety first: Place the unit in bypass to restore water to the home. Disconnect power before opening the valve head.

  • 1. Attempt manual advance: If the control panel allows, use the advance button to step through stages. If it will not advance, suspect motor or control issues.
  • 2. Inspect motor and cam: Remove the cover and check that the motor is connected and the cam is not jammed by debris.
  • 3. Power cycle and re-home: With the cam in a neutral position (per service manual), power up the unit and allow it to find home.

If the valve cannot complete a cycle after these steps, the drive motor, cam sensor, or entire valve head may need replacement.

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Repair Difficulty

Hard 4/5

Required Part

Amfa4000 Valve Drive Motor
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