Sn2 error; spa may shut down heater and show unstable temperature readings.

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

Failed high-limit thermistor, Loose sensor in heater well, Damaged sensor cable, Corroded connector

Safety: Disconnect power at the breaker before accessing the heater area.

Locate Sn2 sensor: Typically mounted on or near the heater tube as a separate probe from the main temperature sensor.
Check mounting: Ensure the sensor is firmly clamped or inserted into its well and not hanging loose.
Inspect wiring: Look for damage or corrosion along the cable and at the control board connector. Clean and reseat as needed.

If Sn2 remains after reseating and inspection, replace the high-limit sensor with the correct Hanscraft part.

Medium 3/5

Hanscraft High-Limit Temperature Sensor

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