# Maximum Iteration exceeded error

**URL:** <https://www.simscale.com/forum/t/maximum-iteration-exceeded-error/96372>\
**Category:** Thermal\
**Created:** [November 17, 2022, 7:00pm UTC](https://www.simscale.com/forum/t/maximum-iteration-exceeded-error/96372 "2022-11-17T19:00:29Z")\
**Posts on this page:** 1\
**Showing post:** 6

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**Author:** ![RicardoParis](https://www.simscale.com/forum/user_avatar/www.simscale.com/ricardoparis/32/30222_2.png) [@RicardoParis](https://www.simscale.com/forum/u/RicardoParis)\
**Post date:** [November 22, 2022, 2:25pm UTC](https://www.simscale.com/forum/t/maximum-iteration-exceeded-error/96372/6 "2022-11-22T14:25:42Z")

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Hello,

From having a look at the solver log, the simulation fails because one of the flow regions reaches negative temperatures:

 ![image](https://www.simscale.com/forum/uploads/default/original/3X/b/1/b114054b5ffacfe3a92de42d0c8592ee228555e7.png)

This is likely related to some faces that are unnecessarily complex for the third flow region:

 ![image](https://www.simscale.com/forum/uploads/default/original/3X/2/c/2c678738190424539efb12f15aceab0922a27543.jpeg)

You may find these faces close to the inlet and outlet faces of the air domain. I’d suggest cleaning up the CAD model around those regions. See this thread for more info: [Most Common CAD Issues with an Example](https://www.simscale.com/forum/t/most-common-cad-issues-with-an-example/96356)

Cheers

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