> 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-6000/instrumentation-novaseq-6000-troubleshooting-list/000001306.md).

# Troubleshooting "Unable to Generate a Focus Model" error on the NovaSeq 6000

**Error message**:

"Unable to generate a focus model for the flow cell, which requires an onsite correction. Contact Technical Support for help."

![](/files/Gg0RZAPCV9k4g6Djp5MA)

**Figure 1.** Example Error message in NovaSeq Control Software

The focus model is generated by the Focus Tracking Module (FTM) and Line Generation Module (LGM). The FTM is a secondary onboard laser diode separate from main Red and Green lasers of the LGM. Failure to generate a focus model is related to either low intensities of the lasers on the Focus Tracking Module (FTM), a consumable issue with the flow cell, fluidics, temperature, or other optical issues.

**Troubleshooting steps:**

1. Power cycle the instrument.
   1. For more information, review the Knowledge Base article [How to Power Cycle the NovaSeq 6000](https://github.com/illumina-swi/illumina-knowledge/tree/master/articles/Knowledge/How-to-Power-Cycle-the-NovaSeq-6000-System/README.md).
2. Once the instrument initializes successfully, perform a system check.
   1. For more information, review the Knowledge Base article [How to perform system checks on the NovaSeq 6000](https://github.com/illumina-swi/illumina-knowledge/tree/master/articles/Knowledge/How-to-perform-system-checks-on-the-NovSeq-6000/README.md).
3. Inspect the flow cell for any debris/glass shards or defects.
4. Collect the following files and contact [Illumina Technical Support](https://emea.illumina.com/company/contact-us.html#/united-states/technical-support) (<techsupport@illumina.com>) for instructions on how to upload the compressed Alignment folder to a secure site for review and next steps.
   1. Logs folder: C:\ProgramData\Illumina\NovaSeq\NovaSeqTemp\[Run\_Folder]\Logs
   2. Alignment folder: C:\ProgramData\Illumina\NovaSeq\NovaSeqTemp\[Run\_folder]\Alignment

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| *For any feedback or questions regarding this article (Illumina Knowledge Article #1306), contact Illumina Technical Support* [*techsupport@illumina.com*](mailto:techsupport@illumina.com?subject=Question%2FFeedback%20Regarding%20Illumina%20Knowledge%20Article%20#000002495%20-%20Instrumentation%20\&body=Dear%20Illumina%20Technical%20Support,%0D%0A%0D%0A)*.* |


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