Why does heating remain ON, even in OFF mode?

This behavior can occur when the HVAC system has been configured as a heatpump HVAC system when the HVAC system is of a different type and the thermostat system code selected begins with a 3 or 8, and ends with either M, N, O or P. This is caused by the W1-O/B wire being energized for the reversing valve to be in cooling mode when active. This behavior can be corrected by changing the system code to match the HVAC system type.

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

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