LightwaveRF LW921 Instruction Manual page 11

Device setup
Setting Away, Holiday and Frost modes
1.
Press the 'Program' button, scroll using the Arrow keys, and then press the 'OK'
button when options '3 (Away), 5 (Holiday) or 6 (Frost)' appear on the display.
2.
Select a target temperature by scrolling using the Arrow Keys and
pressing OK when the desired temperature has been selected. This applies
to all three modes.
Programming time, date & o set temperatures
To set the time and date, press the Program button, scroll to option 2 using
the Arrow keys, and press the OK button. Scroll to select the correct, year,
month and day followed by the time, and press OK to save it.
.
Setting the o set temperature causes the Thermostat to display a current
temperature that is higher or lower that the actual temperature measured.
It can be raised or lowered in 1 degree increments using the arrow keys and
saved by pressing the OK button.