E04
Harris Overvoltage Protection Fault

Pump display shows E04 and motor will not start or shuts down shortly after starting

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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 line voltage (wired for 115V but supplied 230V), Utility overvoltage condition, Miswired dual-voltage motor leads, Faulty transformer or supply equipment

How to Fix / Troubleshooting

Safety first: De-energize the circuit at the breaker and verify with a meter before touching any conductors.

  • Confirm nameplate voltage: Check the Harris pump motor nameplate for rated voltage and wiring diagram. Ensure the pump is configured for the actual supply voltage.
  • Measure supply voltage: With a multimeter, measure the line voltage at the pump terminals. If it exceeds the rated voltage by more than 10%, contact an electrician or utility provider.
  • Verify motor lead configuration: For dual-voltage Harris motors, open the rear wiring compartment and confirm the jumpers or leads are arranged per the diagram for 115V or 230V as appropriate.
  • Inspect for incorrect transformer or booster: If the pump is fed through a transformer or booster, verify its output rating and connections.

Do not operate the pump until the overvoltage condition is corrected. Prolonged overvoltage can permanently damage the motor and control module.

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Repair Difficulty

Medium 3/5

Required Part

Harris pump control module
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