Sn2 error, spa may overheat or not regulate temperature correctly

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 sensor on Villeroy & Boch heater, Loose sensor mounting, Corroded sensor connector, Control board sensor circuit fault

Safety: Disconnect power at the breaker.

Locate sensor 2: Identify the secondary sensor on the heater tube (often the high-limit sensor) and inspect its mounting and wiring.
Reseat connector: Unplug and reconnect the sensor at the control board.
Replace if necessary: If the sensor is cracked or corroded, replace it with the correct Villeroy & Boch sensor.

Continued Sn2 errors after sensor replacement indicate a likely control board fault.

Hard 4/5

High Limit Sensor

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