E17
Zodiac
Mode / Sensor Mismatch Fault
Zodiac pool heater displays E17; may occur when switching between pool and spa modes.
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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 sensor placement, Faulty spa temperature sensor, Miswired pool/spa sensor leads, Control configuration error
How to Fix / Troubleshooting
Safety: Turn off power before working on sensor wiring.
- Verify sensor locations: Confirm that the pool and spa temperature sensors (if separate) are installed in the correct plumbing locations as per Zodiac instructions.
- Check wiring labels: Ensure that pool and spa sensor leads are connected to the correct terminals on the control board. Swap if they are reversed.
- Test sensors: Measure resistance of each sensor and compare to the temperature chart. Replace any sensor that is open, shorted, or significantly out of range.
- Review configuration: Access the heater's setup menu and verify that pool/spa modes and sensors are configured correctly.
- Retest: Restore power and switch between modes to confirm that E17 no longer appears.
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Repair Difficulty
Medium
3/5
Required Part
Spa Temperature Sensor
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