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Hello Colleagues,

Yes. I found this to be the case to. When I got that error it ended up because of the U value for the Walkin was all off. It seemed to happen when working in OpenStudio at IP units. I found that by switching back to metric units before I simulate the U=value I assigned would stay and not default to the large 255 number that errors out the program.

I used 0.285 W/m2-K = R-20 (U=0.05 Btu/hr-ft2-R) and it ran no problem.