As Andy says there is a 'change' button so you can up/down the temperature
setting but only for that session.
I have my heating controlled by the stat, heating on boiler controller is
set to on.
When house is empty I have it set to 16C, keeps the chill off the house.
I have saved a lot of gas 'money' using the 4 time zones.
I also have my heating set up with a zone valve to each floor, with a
programmable stat on each floor, zone valve on cylinder with stat, overnight
I use electricity white meter to heat water, cheaper per BThU than gas.
Click to see the full signature.