1: Press the button to turn off the screen.
2: Press and hold the down arrow button until an 02 appears in the Roof Temp, when you see the 02 appear remove your finger.
3: Using the button - short continuous pushes until you see 02 on the top (Roof Temp) and 5 underneath (House Temp) NB: The light should go off.
4: Press the and this will save your changes.
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