Why is my fan always ON, even when in OFF mode?

Some HVAC control boards can be more sensitive to the output circuit of Zen Thermostats with SKU Numbers of Zen 01.06 or lower. This behavior can be identified by checking if the fan remains on when the Zen Thermostat is in OFF mode or in AUTO mode and the Zen Thermostat is not active. This behavior can been corrected by changing the Zen Thermostat to one with a SKU Number of Zen 01.07 or higher.

For a more detailed description of this behavior please see the attachment below.

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