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Interzone surfaces transfer heat between zones, and they are described as two mirrored surfaces, one for each zone. So, if you have a wall, for example, in Zone 1 with azimuth 90, then the matching wall in Zone 2 should have an azimuth of 270. This error message should give you more details on the specific surfaces in question, but you may need to add Output:Diagnostics, DisplayExtraWarnings; to see that information.