How do I set the thermostat to hold a temperature indefinitely, such as when going on vacation?
Press the Hold Temp key, then press the Warmer or Cooler key; HOLD will appear on the display to confirm the temperature is locked. To cancel the hold and return to the normal program, press the Run Program key. (Page 16)
From the official Honeywell CT3355 Home Programmable Thermostat manual, page 16
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