# ModelingToolkit Symbolics maxiters not enough
**URL:** https://discourse.julialang.org/t/modelingtoolkit-symbolics-maxiters-not-enough/133463
**Category:** Modelling & Simulations
**Tags:** modelingtoolkit
**Created:** [October 27, 2025, 5:03pm UTC](https://discourse.julialang.org/t/modelingtoolkit-symbolics-maxiters-not-enough/133463 "2025-10-27T17:03:44Z")
**Posts on this page:** 3
**Page:** 1
### Author:  [@AlirezaMiraliakbar](https://discourse.julialang.org/u/AlirezaMiraliakbar)
#### Post date: [October 27, 2025, 5:03pm UTC](https://discourse.julialang.org/t/modelingtoolkit-symbolics-maxiters-not-enough/133463/1 "2025-10-27T17:03:44Z")
Hi, I am trying to model a chemical process with modeling toolkit and I have set 4 of my variables to `irreducible = true`. However, with doing this, I get the warning message from Symbolics that:
```julia-auto
Warning: Did not converge after `maxiters = 100` substitutions. Either there is a cycle in the rules or `maxiters` needs to be higher.
```
How can I increase the maxiters to resolve this warning and make sure everything is working correctly?
Thank you very much.
---
### Author:  [@ufechner7](https://discourse.julialang.org/u/ufechner7)
#### Post date: [October 27, 2025, 6:28pm UTC](https://discourse.julialang.org/t/modelingtoolkit-symbolics-maxiters-not-enough/133463/2 "2025-10-27T18:28:28Z")
Which packages are you using? What is the output of:
```julia-auto
using Pkg
Pkg.status()
```
?
---
### Author:  [@ChrisRackauckas](https://discourse.julialang.org/u/ChrisRackauckas)
#### Post date: [October 28, 2025, 7:08pm UTC](https://discourse.julialang.org/t/modelingtoolkit-symbolics-maxiters-not-enough/133463/3 "2025-10-28T19:08:48Z")
And please share code that demonstrates the issue.