> 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/miseq-ruo/instrumentation-miseq-ruo-troubleshooting-list/000007050.md).

# Troubleshooting failed MiSeq system checks

**Note**: For how to perform a MiSeq system check, see [How to perform a System Check on the MiSeq](/instrumentation/miniseq/instrumentation-miniseq-reference_material-list/000001777.md).

The MiSeq system checks are comprised of four tests: motion, optics, thermal ramp, and fluidics.

The tests listed under the Illumina Use Only column include the Tip/Tilt and Full Optics tests. These tests require a beaded flow cell to complete successfully. Only Illumina Service Engineers carry a beaded flow cell for performing these tests.

For failed tests, power cycle the instrument, perform a maintenance wash with water and repeat the system check with an alternate flow cell. For instruction about how to do power cycle, please reference [How to Power Cycle the MiSeq](https://github.com/illumina-swi/illumina-knowledge/tree/master/articles/Knowledge/Instrumentation-MiSeq-Shut-down-instructions/README.md) or [How To Power Cycle the MiSeq Video](/instrumentation/miseq/instrumentation-miseq-reference_material-list/000005871.md).

Contact [Illumina Technical Support](https://www.illumina.com/company/contact-us.html) for any repeated failures or further questions.

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| *For any feedback or questions regarding this article (Illumina Knowledge Article #7050), contact Illumina Technical Support* [*techsupport@illumina.com*](mailto:techsupport@illumina.com?subject=Question%2FFeedback%20Regarding%20Illumina%20Knowledge%20Article%20#000005871%20-%20Instrumentation%20\&body=Dear%20Illumina%20Technical%20Support,%0D%0A%0D%0A)*.* |


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