Er5
Hayward
Phase Loss / Output Drive Fault
Display shows Er5 and pump will not run.
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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
Failed IGBT or power transistor in drive, Internal short in motor windings, Loose internal power connections, Severe voltage imbalance
How to Fix / Troubleshooting
Safety first: Turn off power at the breaker. Do not repeatedly attempt to start a pump showing Er5, as further damage may occur.
- Visual inspection: Remove the drive cover and inspect for burned components, melted plastic, or a burnt smell from the power board.
- Check motor windings: With the pump disconnected, a qualified technician can measure resistance between motor phases to detect shorts or opens.
- Verify supply: Confirm that the incoming power is balanced and correctly wired per Hayward specifications.
- Replace assembly: In most cases, Er5 indicates a failed drive power stage or motor. Replace the motor/drive assembly as a unit following Hayward service guidelines.
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Repair Difficulty
Professional Required
5/5
Required Part
Motor / Drive Assembly
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