Heatrae Sadia Multipoint ECO 100L V 3kW Installation, Operation And Maintenance Manual page 22

Program enable/disable/modifications
A preset program can be disabled (OFF) or enabled (ON). This function suspends a program for an undefined period of time
without clearing the program setting. When the program is enabled, "PROG" is displayed at the top right corner of the display.
Anti Legionella Cycle
The anti-legionella feature reduces the risk of development of bacteria in the water stored inside the tank. As soon as the water
heater is correctly installed and in operation, and regardless of the selected mode the water temperature will be permanently
monitored. Whenever risk conditions are detected, water in the tank is below 60° C for more than 21 days, the software will
automatically perform a heat cycle to a temperature of 65° C.
The anti-legionella cycle is indicated by a progressive rotating rectangle, see below.
Child Lock / Unlock
To activate or disable the child lock, long press simultaneously
Child lock is indicated by an animated display.
Backlight
The LCD display comes with a backlight which offers high visibility of the display in dark condition. The LCD backlight
will be activated each time the product is turned ON or any key is pressed.
The backlight will automatically reduce after a time of 18s without any user interaction.
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and keys.