Display shows SN1 or SENSOR1 and spa may not heat or may shut down.
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.
Possible Causes
How to Fix / Troubleshooting
Safety: Turn off power at the breaker before working near the control box.
- Compare temperatures: Feel the water and compare to the displayed temperature. If the reading is wildly inaccurate, suspect the sensor.
- Inspect sensor lead: Trace the temperature sensor cable from the heater manifold or shell to the control box. Look for cuts, abrasions, or rodent damage.
- Check connection: Open the control box and verify the sensor plug is fully seated on the Jacuzzi control board and free of corrosion.
- Reseat sensor: Ensure the sensor bulb is fully inserted into its drywell or plumbing fitting and secured with the retaining clip.
If SN1 persists, the temperature sensor should be replaced with a compatible Jacuzzi sensor. If a new sensor does not resolve the error, the control board input may be defective.
Repair Difficulty
Required Part
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