Jacuzzi pool heater runs but water temperature overshoots the setpoint by several degrees.

Safety first: Turn off power before moving sensors.

Steps to reduce overshoot:

• Verify sensor location: Ensure the Jacuzzi temperature sensor is installed in the main return line, not in a dead leg or bypass.
• Compare temperatures: Use a separate thermometer to confirm actual water temperature vs display. Replace the sensor if readings are inaccurate.
• Adjust controller settings: If using automation, reduce the temperature differential or hysteresis so the heater shuts off closer to setpoint.