How do I permanently override the program schedule and hold a set temperature?
Press the HOLD button to permanently override all programmed time period temperatures. The thermostat will maintain whatever temperature you set 24 hours a day until you manually change it or press RUN SCHEDULE to cancel the Hold and resume the programmed schedule. (Page 13)
From the official Honeywell T6220D Programmable Thermostat manual, page 13
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