How do I hold a temperature indefinitely, such as when I go on vacation?
To hold a temperature indefinitely, press the HOLD key and then press the Warmer or Cooler key to set your desired temperature; HOLD will appear on the display. To cancel the hold and return to the normal programmed schedule, press the RUN PROGRAM key. (Page 16)
From the official Honeywell CT3355 Home Programmable Thermostat manual, page 16
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