E2
Certikin
Temperature Calibration / Sensor Range Error
E2 displayed; heater may run but temperature readings are clearly incorrect.
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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 type fitted to Certikin heater, Sensor resistance out of range due to age, Poor electrical connection causing intermittent readings, Control PCB calibration fault
How to Fix / Troubleshooting
Safety first: Isolate power before testing sensors.
- Compare temperatures: Measure pool water with an independent thermometer and compare to the heater display.
- Check sensor connections: Tighten terminal screws or reseat plugs for all temperature sensors on the control PCB.
- Visual sensor check: Inspect sensors for swelling, cracking, or corrosion at the probe end.
- Reset controller: Power cycle the heater and, if available, perform a factory reset of the Certikin controller following the manual.
If E2 persists, the sensor(s) should be tested with a multimeter and replaced with genuine Certikin parts if out of specification.
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Repair Difficulty
Medium
3/5
Required Part
Certikin temperature sensor set
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