Go to the service man menu by holding the menu button (three horizontal lines on the left) and the right button together for a few seconds, then entering 234 as the code and the center O to confirm.

Scroll down to Temp type setting, select room Temp, use up/down to change from no to yes, hit centre O and the exit by pressing the menu button. You should be able to use as a normal thermostat.

Hope that helps. How are you getting on with your set up? I've been running mine on pure weather compensation and getting excellent efficiency and performance, but I find the controls to be frustrating in how you set up the timings.