Err4
Zodiac
Drive Overtemperature / Electronics Overheat
Zodiac variable-speed pump shows ERR4 and stops running.
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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
Pump installed in direct sun with poor ventilation, Blocked cooling fins on drive, High ambient temperature, Internal fan failure (if equipped)
How to Fix / Troubleshooting
Safety: Turn off power and allow the unit to cool before touching the drive housing.
- Improve ventilation: Ensure the pump has adequate clearance on all sides and is not enclosed in a small, unventilated box.
- Shade the equipment: If the pump is in direct sun, consider adding a shade structure that does not block airflow.
- Clean cooling surfaces: Gently brush or blow dust and debris off the drive heat sink and any external fins.
- Check load: Verify that the pump is not running at maximum speed against a highly restricted system. Clean filters and open valves to reduce backpressure.
If ERR4 continues under normal conditions, the drive's thermal sensor or internal cooling may be faulty and the drive module may need replacement.
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Repair Difficulty
Hard
4/5
Required Part
Pump Drive / Control Module
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