What should I do if I made a mistake during the Infinity Thermostat start-up process?
If you made a mistake on the start-up screens and want to return to the initial setup sequence, press the ADVANCED button for at least 10 seconds to access the INSTALL/SERVICE menu. Scroll down to the INSTALL selection and press the right-side button. The screen will prompt you to press the right side button again to re-install the system, allowing you to restart the initial power-up sequence and correct any equipment selections.
From the official Carrier Infinity Smart Thermostat manual, page 17
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