E15
Zodiac
Safety Circuit Open (Limit String Open)
Zodiac pool heater displays E15; heater may not start and may indicate a safety chain issue.
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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
Open high limit switch, Open pressure switch, Open fusible link, Loose safety circuit wiring
How to Fix / Troubleshooting
Safety: Disconnect power before testing safety switches. Never bypass safety devices for operation.
- Trace safety circuit: Using the wiring diagram on the heater door, identify all safety devices in series (pressure switch, high limits, fusible links, rollout switch).
- Check connections: Inspect each device for loose or corroded terminals. Reseat connectors and repair any damaged wires.
- Test continuity: With power off, test each safety device individually with a multimeter. Any device that remains open at normal temperature and conditions should be replaced.
- Reset manual devices: If any safety has a manual reset button (e.g., rollout), reset once after the heater has cooled and investigate the cause of the trip.
- Replace failed safety: Install Zodiac-approved replacement switches or links only. Do not substitute with non-rated parts.
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Repair Difficulty
Medium
3/5
Required Part
High Limit Switch
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