Pentair SuperFlo Unstable Speed Control / Drive Regulation Issue

Pump speed fluctuates up and down without changes to settings (VS models).

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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

Unstable line voltage, Drive electronics degradation, Incorrect feedback from motor, External automation sending conflicting commands

How to Fix / Troubleshooting

Safety first: Turn off power before accessing wiring or drive components.

  • 1. Check for external control conflicts: If the pump is tied to automation, ensure only one control source is active. Disable internal schedules if automation is in charge.
  • 2. Verify line voltage stability: Have an electrician measure voltage at the pump while running. Large swings can cause speed fluctuations.
  • 3. Reset programming: Perform a factory reset and reprogram a single, simple speed schedule to test stability.
  • 4. Observe for error codes: If fluctuations are accompanied by intermittent error codes, the drive or motor feedback may be failing, requiring replacement.
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Repair Difficulty

Medium 3/5

Required Part

SuperFlo VS Drive (Control Module)
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