How do I change and save a parameter value in the menu?
Press the Set key to view the existing value of a parameter, then use the direction keys to change it, and press the Set key again to save the data. Be aware that if no operation is performed within 8 seconds, the new data will be discarded and the unit returns to normal status. (Page 2)
From the official Tense Stc 1000 Thermostat manual, page 2
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