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.

Thank you to all who responded. This error has been corrected.
I was able to right click and reverse surfaces and the Azimuth problem was corrected. Also, I had surfaces that where a roof/ceiling was mating to a roof ceiling. Changing roof/ceiling to floor for these surfaces fixed the Tilt problem. Thank you, Matt

Hi all, today I have the same problem but I have solved it. The sequence of the vertexes should be clockwise in the first surface and counter clockwise in the mirrored surface. If you have a surface with four vertexes 1-4, they are for the mirrowed suface the other way round: e.g

• surface -> mirrored surface
• 0,0,0 vertex 1 -> vertex 4
• 1,0,0 vertex 2 -> vertex 3
• 1,0,2,vertex 3 -> vertex 2
• 0,0,2,vertex 4 -> vertex 1

I have changed it manually in the osm file. Maybe there is a more elegant way.