Advanced function 10 in the advanced settings menu allows you to set the thermostat to “easy” configuration, where only comfort and economy modes can be chosen and the thermostat programming is not available. You can reset to the normal “prog” configuration, where all modes are available, in the advanced settings menu.
Navigate to the advanced functions menu by holding down the tick key until you reach the time setting screen, then holding down tick for a further five seconds. Select the function you want to adjust with the – and + keys, press tick to confirm and then to modify. To leave the menu, select the “End” function and press tick to confirm. See full guide to the advanced function menu attached.
Haverland TOD Programming Guide