RTH4300B Programmable Thermostat
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About your new thermostatSystem setup (set thermostat to match your system)

Next, you must set the thermostat to match the heating/cooling system in your home.

Press and hold the s and t buttons to enter system setup.

Function
number
Setting
To begin, press and hold the s and t
buttons until the display changes.
Press t to change settings.
Press s to advance to next function.
Press and hold ts to exit and save settings.
Setup
1
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