Question-and-Answer Resource for the Building Energy Modeling Community
 | 1 | initial version |
It might be that you have CONSTRUCTION:INTERNALSOURCE constructions set on all your floors and ceilings. You should only have this construction on the floor/ceiling that is thermally active (and its opposite in the other zone). The other floors and ceilings should be just normal construction. This is probably why your simulation runs when you put Radiant Floor in all your zones and crashes when you don't.
