How do I restore the EnergyStar default settings on my thermostat?
Follow these steps to restore EnergyStar default settings: (1) Press SET CLOCK/DAY/SCHEDULE, (2) Press SET SCHEDULE, (3) Press DONE and NEXT at the same time for 4 seconds. This will reset your thermostat to the pre-configured energy-saving program settings.
From the official Honeywell T6220D Programmable Thermostat manual, page 18
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