Why does the display only show "ZEN" on screen?

This behavior occurs when the thermostat is brand new out of a sealed box or has been factory reset and has not been configured with a system code. This behavior can be corrected by configuring the Zen Thermostat by following the installation guide at www.zenthermostat.com/install/install.

 

For a more detailed description of the Filter icon and how to reset it please see the attachment below.

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