The Set-up menu is accessed by pressing the buttons for 5 seconds.

Press the button until you see on the screen 'SPL', this is the minimum limit.
Keep the button pressed to set the desired value: this is '+5', the temperature of the warmer never becomes cooler than +5 °C.

When the button is released, the newly programmed value is stored and the following parameter is displayed: 'SPH', this is the maximum limit.
Keep the button pressed to set the desired value: this is '+40', the temperature of the warmer will never become hotter than + 40°C.

When the button is released, the newly programmed value is stored and the following parameter is displayed.

Press the button until you see on the screen '1HY'. Keep the button pressed, use buttons to set the desired value: this is '-1'.

'1HY' is the thermostat differential. If the warmer cools down 1 °C, it switches on automatically and if the warmer heats up more it switches off automatically.

To exit from the Set-up, press button or wait for 30 seconds.