The screen will wake up by pressing any of the five buttons. If powered by the C wire, the screen stays lit for 45 seconds
after you complete changes. If powered by battery only, the screen stays lit for 8 seconds. Depending on how your
thermostat was installed, the screen light may always be on.
Customer assistance
For assistance with this product, please visit Honeywellhome.com/support
System operation settings
1. Press the Mode button to cycle to the next available System mode.
2. Cycle through the modes until the required System mode is displayed and leave it to activate.
NOTE: Available System modes vary by model and system settings.
System modes:
‒ Auto
‒ Heat
‒ Cool
‒ Off
‒ Em. Heat (TH4210U only)
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