How do I restore the EnergyStar default settings on the Honeywell 6000?
Press SET CLOCK/DAY/SCHEDULE, then SET SCHEDULE. Press and hold DONE and NEXT buttons simultaneously for 4 seconds to restore the Energy Star default settings. This will reset your thermostat to the recommended energy-saving program that can reduce heating and cooling expenses by as much as 33%.
From the official Honeywell 6000 Series Programmable Thermostat manual, page 18
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