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Neal's answer is helpful if you're comfortable working in EnergyPlus, but it sounds like you're using OpenStudio, in which case the Surface Search Tool will be helpful to identify the problem surfaces in your model.

These could be degenerate surfaces caused during geometry creation or surface matching. I would also suggest doing a search of this site for the tag surface for additional information.

Neal's answer is helpful if you're comfortable working in EnergyPlus, but it sounds like you're using OpenStudio, in which case the Surface Search Tool will be helpful to identify the problem surfaces in your model.

These could be degenerate surfaces caused during geometry creation or surface matching. I would also suggest doing a search of this site for the tag surface for additional information.