How do I temporarily or permanently override the programmed schedule?
To temporarily override the schedule, press the + or – button to adjust the temperature — the new setpoint will hold until the next scheduled period begins. To make it a permanent hold, while the setpoint is flashing, press the Hold (Mode) button to switch to Permanent Hold. To cancel either type of hold, press + or – and then press Cancel. (Page 4)
From the official Honeywell T4 Pro Programmable Thermostat (TH4110U2005/U) manual, page 4
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