UV
Jandy Under-Voltage Supply Condition

Variable-speed Jandy pump intermittently shuts down and displays UV or UNDER VOLTAGE warning.

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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

Low line voltage from service panel, Loose electrical connections at pump terminals, Undersized wiring causing voltage drop, Shared circuit overloaded with other equipment

How to Fix / Troubleshooting

Safety first: Turn off power at the breaker before opening any electrical covers. Work with a licensed electrician if you are not qualified.

  • Inspect wiring connections:
    • Remove the electrical cover on the Jandy pump motor/drive.
    • Check that all line and ground connections are tight and free of corrosion.
  • Check wire size and run length:
    • Compare installed wire gauge to Jandy installation manual requirements for the pump’s amperage and distance.
    • If wire is undersized for the run length, have an electrician upgrade the wiring.
  • Reduce circuit load:
    • Ensure the pump is on a dedicated circuit where possible.
    • Avoid running high-load devices (e.g., heaters, large air conditioners) on the same circuit.
  • Measure voltage:
    • Have an electrician measure voltage at the pump while running; it should be within the specified range (typically within ±10% of nameplate voltage).
  • If UV persists: The issue is likely with the supply or service panel. Have a licensed electrician or utility provider investigate and correct the low-voltage condition.
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Repair Difficulty

Professional Required 5/5
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