Verify the solid bodies and their materials.
In the history tree, expand Model / Solids.
Under Solids, branches for air and copper_temp solid materials are visible.
Expand the copper_temp branch to see the names of the bodies made of that material. When you click a body's name in the tree, it is highlighted in the modeler window.
Note the following bodies, which will receive thermal data from the Fluent participant:
bus1
bus2
bus3