NetSpa Temperature Sensor Drift / Miscalibration

NetSpa spa displays temperature that is clearly inaccurate (e.g., shows 40°C when water feels lukewarm) but no error code appears.

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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

Aging NTC sensor, Sensor coated with scale, Poor water contact due to air pocket, Control PCB calibration drift

How to Fix / Troubleshooting

Safety first: Keep electrical components dry while checking water temperature.

  • Verify with thermometer: Measure water temperature with a reliable thermometer and compare to the display.
  • Improve circulation: Clean the filter and run the pump to ensure even temperature distribution.
  • Descale heater tube: If allowed by NetSpa, use a spa-safe descaling product to remove scale that may insulate the sensor.

Persistent large discrepancies indicate a failing temperature sensor or control board. Replacing the NetSpa temperature sensor probe is usually the first step.

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Repair Difficulty

Medium 3/5

Required Part

NetSpa NTC temperature sensor probe
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