# NPT steps warnings

**URL:** <https://gromacs.bioexcel.eu/t/npt-steps-warnings/11119>\
**Category:** User discussions\
**Tags:** mdp-parameters\
**Created:** [January 22, 2025, 11:17pm UTC](https://gromacs.bioexcel.eu/t/npt-steps-warnings/11119 "2025-01-22T23:17:12Z")\
**Posts on this page:** 1\
**Page:** 1

<div class="post-metadata">

**Author:** ![Scola](https://avatars.discourse-cdn.com/v4/letter/s/35a633/32.png) [@Scola](https://gromacs.bioexcel.eu/u/Scola)\
**Post date:** [January 22, 2025, 11:17pm UTC](https://gromacs.bioexcel.eu/t/npt-steps-warnings/11119/1 "2025-01-22T23:17:12Z")

</div>

GROMACS version: 2024.3  
GROMACS modification: No

Hi,

I’m running a NPT step for my system(the previous energy minimization and NVT step looks fine, potential are converged and temperature are stable), and I’m using the Parrinello-Rahman pressure coupling. But I’ve encountered a lot of errors, and the error looks like this(only select few of them):

```auto
Step 93076 Pressure scaling more than 1%. This may mean your system is not yet equilibrated. Use of Parrinello-Rahman pressure coupling during equilibration can lead to simulation instability, and is discouraged.
step 93100, remaining wall clock time: 206 s          
Step 93101 Pressure scaling more than 1%. This may mean your system is not yet equilibrated. Use of Parrinello-Rahman pressure coupling during equilibration can lead to simulation instability, and is discouraged.

Step 93126 Pressure scaling more than 1%. This may mean your system is not yet equilibrated. Use of Parrinello-Rahman pressure coupling during equilibration can lead to simulation instability, and is discouraged.

```

Can anyone help me see if this is a critical problem or how I can improve this?

Thank you!