Have you run across the DOE2.3 Error, "Abnormal Simulation Results Detected"? There is now a technical resource on the DOE2.3 downloads page that allows you to interpret what MsgBomb codes mean. This is fairly new having been posted or updated on 3/30/23. Here's the link: https://doe2.com/Download/DOE-23/MSGb.... When these errors happen during system sizing, there are few other debugging options to use to find the issue since there are no hourly reports or .SIM HVAC sizing reports produced at that point of the run. Good luck!