If your system uses a heat pump and blows in cool air when the ZEN thermostat is set to “heat” mode (the “heat” or “flame” icon is on), this is likely to be a configuration error. You may need to reverse the functionality of the heat pump O/B wire. In order to change the setting on the O/B wire, repeat the configuration process, this time selecting the opposite wire to your last choice (O instead of B or B instead of O).
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