How can I solve: CheckWarmupConvergence: Loads Initialization

The simulation in open studio works but I get the same "severe" message for all my thermal zones. My building is large and contains a lot of thermal mass. During the simulation there was no internal load present and also no HVAC (with HVAC and with internal loads I get the same "severe" message).

Is this bad? And how can this be solved?

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If you're using the OpenStudio application, you can go to the Simulation Settings tab, expand Simulation Control, and increase the "Maximum Number Of Warmup Days" above the default of 25.

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If that doesn't help, there are also inputs for "Temperature Convergence Tolerance Value" and "Loads Convergence Tolerance Values" that could be changed as a fallback.