How do I temporarily override the program schedule to change the temperature?
Press the up or down arrow to immediately adjust the temperature, which will temporarily override the current time period setting. The new temperature will be maintained only until the timer expires, at which point the program schedule will resume. You can cancel the temporary override at any time by pressing CANCEL or SCHED to resume the program schedule (page 12).
From the official Honeywell Programmable U1003 Thermostat manual, page 12
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