Question-and-Answer Resource for the Building Energy Modeling Community
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You should double check that you are actually providing the correct combination of Radiant Surface Type with the ConstructionInternalSource object you use.
You place a Low Temp system into a zone. The Low Temp System has a "Radiant Surface Type" field that you should pay close attention to. To debug, you could switch it to AllSurfaces for now.
Your zone has one or more spaces, and this/these space(s) should end up with at least one surface of the given type that has a ConstructionInternalSource assigned to it. Otherwise, your Low Temp system will not be translated (source in C++ code: ForwardTranslateZoneHVACLowTempRadiantConstFlow.cpp#L75-L85
