E11
Zodiac
Flame Sense Circuit Error
Zodiac pool heater displays E11; ignition may start but then lock out.
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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
Shorted flame sensor to ground, Broken flame sensor wire, Contaminated flame rod, Faulty ignition control board flame circuit
How to Fix / Troubleshooting
Safety: Turn off power and gas before servicing ignition components.
- Inspect flame sensor lead: Follow the wire from the flame sensor to the ignition control board. Look for insulation damage, pinched sections, or contact with metal surfaces that could cause a short.
- Clean flame sensor: Remove the sensor and gently clean the rod with fine abrasive pad to remove soot and oxidation. Do not bend the rod.
- Check mounting: Ensure the sensor is properly positioned in the burner flame path and securely mounted with clean contact to the burner bracket.
- Test continuity: With power off, verify continuity of the flame sensor wire from the rod terminal to the board connector. Repair or replace damaged wiring.
- Board evaluation: If wiring and sensor are good but E11 persists, the ignition control board's flame sense circuit may be defective and require replacement.
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Repair Difficulty
Hard
4/5
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