> For the complete documentation index, see [llms.txt](https://knowledge.illumina.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://knowledge.illumina.com/instrumentation/novaseq-x-x-plus/instrumentation-novaseq-x-x-plus-troubleshooting-list/000010228.md).

# Troubleshooting a dry system thermal pre-run check failure on the NovaSeq X Series

**Background**

For NovaSeq X Series instruments, a pre-run check is performed prior to sequencing. During this process, the thermal check in the dry check may occasionally result in a failure. In such cases, a message similar to the one shown below may be displayed on the control software.

TemperatureAirxxx with value ## DegC was greater than ## DegC.

**Troubleshooting steps**

1. Check the laboratory environment.
   * Verify the room temperature. If it is higher than the acceptable range, request that it be lowered.
   * Check the filter condition:
     * Make sure the filter has been replaced appropriately.
     * Confirm that the filter is not blocked or clogged.
2. Retry the Pre-Run Check, by selecting Retry.
3. If the error occurs again:
   \*
   * Power cycle the instrument.
   * Reconfigure and start the run again.
4. If the issue persists, contact [Illumina Technical Support](https://www.illumina.com/company/contact-us.html#/united-states/technical-support).

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| *For any feedback or questions regarding this article (Illumina Knowledge Article #10228), contact Illumina Technical Support* [*techsupport@illumina.com*](mailto:techsupport@illumina.com?subject=Question%2FFeedback%20Regarding%20Illumina%20Knowledge%20Article%20#000010228%20-%20Instrumentation%20\&body=Dear%20Illumina%20Technical%20Support,%0D%0A%0D%0A)*.* |


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