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means the mesh needs further refining however it exceeds the number of iteration. Also it suggest that some Finite Element volume is too small. It seems this device does not have curved surface on a flat surface or very thin layer. The mesh will automatically adjusted depending on the optical generation and other factors. Please first try to use smaller optical power by reducing the scale factor. you can also increase the limit for mesh iteration, reduce triangle quality and sensitivity. Please refer to https://optics.ansys.com/hc/en-us/articles/360034918633-CHARGE-solver-Simulation-object
When the coupled simulation is running, maybe one of the solvers needs finer mesh. You can try to simulate HEAT separately and see if it works.
In addition, you can use smaller-step applied votage if zero voltage works.
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