Caldera stuck at 115 degrees

I have a Caldera Aventine Spa. It shut down a few months ago. After shutting off power and restarting, the panel continuously reads a temp of 115 but the spa is not heating and the jets do not activate.

We have drained the spa and replaced the Hi Limit Thermistor and Pressure Switch.

Temp still reads 115 degrees.

Any suggestions would be much appreciated.

It may be the temperature sensor causing this. The temperature sensor is what picks up the temperature for the topside display, so if it thinks the water is this hot it will shut down the system.

Thanks, MaryH..

Is the temperature sensor something I could replace?

Yes, it usually plugs into the circuit board next to where the high limit and pressure switch plugs in to. It may lead to a fitting mounted on the wall of the spa to detect the temperature of the water in the spa.