Hayward Pool Pump Error Code 04: How to Fix It
Medium 30-60 minutes Medium Severity
Verified June 2026
- Error Code
- 04
- Brand
- Hayward
- Product Type
- pool_equipment
- Severity
- Medium
- DIY Difficulty
- Medium
- Estimated Fix Time
- 30-60 minutes
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Tools You'll Need
- Phillips screwdriver
- Flathead screwdriver
- Multimeter with capacitance and resistance modes
- Insulated screwdriver (for discharging capacitors)
- Replacement start capacitor (if needed)
- Replacement run capacitor (if needed)
How to Fix Error Code 04
-
Turn Off Power to the Pump
Always disconnect power before inspecting or servicing the pump to avoid electric shock. -
Check for Obstructions in the Impeller
-
Test the Capacitor (Start/Run Capacitor)
Capacitors can hold a dangerous charge even when power is off. Discharge them safely. -
Inspect Wiring for Damage or Loose Connections
-
Measure Voltage at the Pump
Use extreme caution when working with live electrical circuits. If unsure, call a professional. -
Test for Winding Resistance
-
Replace the Capacitor or Motor if Needed
Always use replacement parts that match the original specifications.
Parts You May Need
Start capacitor
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Run capacitor
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Pump motor
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Start capacitor
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Run capacitor
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Pump motor
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Start capacitor
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Run capacitor
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Pump motor
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Start capacitor
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Run capacitor
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Pump motor
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When to Call a Professional
If you are uncomfortable working with electricity, if the motor windings are shorted (requires motor replacement), or if the pump still trips after checking all steps, call a qualified pool technician.Frequently Asked Questions
What does error code 04 mean on a Hayward pool pump?
Error code 04 indicates an over current trip, meaning the pump is drawing too much current. This is often due to a stuck impeller, bad capacitor, or electrical fault.
Can I reset the error code 04 on my Hayward pump?
Yes, after fixing the underlying issue, you can reset the error by turning off power at the breaker for 5 minutes, then turning it back on. If the error returns, the problem persists.
What causes a Hayward pool pump to trip over current?
Common causes include debris blocking the impeller, a faulty start or run capacitor, low voltage supply, loose wiring, or a shorted motor winding.
Do I need to replace the whole pump if error 04 appears?
Usually not. Most cases are solved by cleaning debris or replacing a capacitor. Only if the motor is shorted should you replace the pump motor.
Is error code 04 dangerous?
It can be if ignored, as it may lead to motor failure or electrical fire. However, the pump's safety trip prevents immediate danger. Address the issue promptly.