Conflicts between boundary conditions scoped to parts and individual faces
Boundary conditions applied to individual geometry faces always override those that are scoped to a part(s). For conflicts associated with various boundary conditions, the order of precedence is as follows:
Applied temperatures (Highest).
Convection, heat fluxes, and flows (Cumulative, but overridden by applied temperatures).
Insulated (Lowest. Overridden by all of the above).