What is the minimum temperature separation required when using Auto Changeover mode?
When using Auto Changeover (Auto system setting), the heat and cool temperature settings must be at least 3 degrees apart. The thermostat will automatically adjust settings to maintain this 3-degree separation, which is called the 'deadband.' This 3-degree separation is fixed and cannot be changed. (Page 14)
From the official Honeywell TH6110D Programmable Digital Thermostat manual, page 14
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