I have been trying to simulate heat transfer problem in Comsol 5.5 for long time but it always throw an error stating:

"Failed to find a solution.

Maximum number of Newton iterations reached.

There was an error message from the linear solver.

The relative error (0.31) is greater than the relative tolerance.

Returned solution is not converged.

Not all parameter steps returned".

please help if anyone has fixed this type of error earlier.

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