Lifesmart Spas
Temperature Overshoot / Sensor Calibration Issue
Water is too hot even though the set temperature is lower.
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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
Misreading water temperature sensor, Sensor not fully in water stream, Stuck heater relay on control board, Poor water circulation around sensor
How to Fix / Troubleshooting
Safety first: Turn off power if water temperature exceeds safe soaking levels (104°F / 40°C).
- Verify with thermometer: Compare displayed temperature to an accurate external thermometer.
- Inspect sensor placement: Ensure the temperature sensor is properly installed in the heater tube and fully contacting water.
- Check circulation: Confirm that water is moving past the sensor when the pump runs.
- Replace sensor: If readings are consistently off, replace the water temperature sensor.
- Board issue: If the heater continues to run with no call for heat, the heater relay may be stuck and the control board should be replaced by a technician.
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Repair Difficulty
Hard
4/5
Required Part
Water Temperature Sensor (Thermistor)
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