First please check if the monitor is inside the simulation region. Sometimes its 3rd dimension is not the same as the simulation region.
Make sure the material properties and the "temperature" BC injects some heats.Â
You can also compare it with online examples, such as this one
https://optics.ansys.com/hc/en-us/articles/360042273574-Heat-flow-in-solids
https://optics.ansys.com/hc/en-us/articles/360042762413-Ohmic-heating-in-a-wire
you can try to rebuild the simulation file from the examples.
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