How do I enter the Installer Setup (ISU) to configure advanced settings?
Press and hold the CENTER and arrow buttons simultaneously for approximately 3 seconds to enter the advanced menu, then press Select to enter ISU. Use the arrow buttons to change values and press Select to confirm settings, or press Back to ignore changes. Press Home when finished to save your settings and return to the Home screen. (Page 8)
From the official Honeywell Honeywell Thermostat Manuals Pro Series Honeywellhome And Others manual, page 8
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