# Troubleshooting Pressure decay or Impedance test stopped with NaN results on the NovaSeq 6000

If Pressure Decay or Impedance test on the NovaSeq 6000 system check stops with NaN result:

* **Check pressure sensor readings:**

  * Close NovaSeq Control Software.
  * Open NovaSeq Service Software (NVSS).
  * Navigate to Integrated Chassis Assembly.
  * Navigate to the Sensors Tab and select the refresh icon for Fluidics.
  * If any sensor is >2.5psi, take a screenshot or picture of the result and collect NovaSeq Service Software Logs located under C:\ProgramData\Illumina\NovaSeq\NovaSeq Service Software\Logs and contact [Illumina Technical Support](https://www.illumina.com/company/contact-us.html#/united-states/technical-support) for the next steps.
  * **Note**: Pressure sensors are not used during a run and, therefore, failing sensors will not impact a run performance. The instrument can continue sequencing until an Illumina Field Service Engineer (FSE) can replace the sensors.

  ![](https://761066130-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2FGM9W2DuBTgEXv1ClCm8H%2Fuploads%2Fgit-blob-69dc5bc4bb02357f56f5e3554e135666e11246cb%2Fimage1.png?alt=media\&token=6420c27b-f0c9-49cd-82df-2203ef5e4081)

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