# Troubleshooting Memory Metal Alloy (MMA) Motion Stalls on the MiSeq i100 Series

**Background**

The Memory Metal Alloy (MMA) assembly is responsible for opening and closing valves when directing the flow of reagents through the dry cartridge. Issues with one of the MMA valves not responding will trigger the instrument to stop the run and present a Sequencing failed error:

![](/files/V5QyimrUiIwhSa2pEAjl)

Failed executing Protocol 2Read2Index after . Motion stall

**Troubleshooting Actions**

1. Select **Eject Cartridge**, then remove the dry and wet sequencing cartridges from the instrument.
2. Power cycle the instrument to ensure all board communications are reset.
   1. See Knowledge Article [How to power cycle the MiSeq i100](https://knowledge.illumina.com/instrumentation/miseq-i100-series/instrumentation-miseq-i100-series-reference_material-list/000009277) for more information.
3. Run the instrument **System Health Checks** using the **Test Cartridges** provided with the instrument.
   1. See Knowledge Article [How to Setup the System Health Checks on the MiSeq i100 Series Instruments](https://knowledge.illumina.com/instrumentation/miseq-i100-series/instrumentation-miseq-i100-series-reference_material-list/000009206) for more information.
4. Once the System Health Checks are complete, select **Clear Checks** and then proceed to the Control Software home screen.
5. Follow the **Export Logs - Small** workflow to bundle the System Health Check results.
   1. Select the affected Sequencing Run from the list when setting up the Export Logs.
   2. See Knowledge Article [How to use the Export Logs feature on the](https://knowledge.illumina.com/instrumentation/miseq-i100-series/instrumentation-miseq-i100-series-reference_material-list/000009265) [MiSeq i100 Series](https://knowledge.illumina.com/instrumentation/miseq-i100-series/instrumentation-miseq-i100-series-reference_material-list/000009265) for more information.
6. Once the **Export Logs** workflow has completed and transferred to the External Storage, contact [Illumina Tech Support](https://www.illumina.com/company/contact-us.html) for further steps.

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| *For any feedback or questions regarding this article (Illumina Knowledge Article #9205), contact Illumina Technical Support* [*techsupport@illumina.com*](mailto:techsupport@illumina.com?subject=Question%2FFeedback%20Regarding%20Illumina%20Knowledge%20Article%20#000009205%20-%20Instrumentation%20\&body=Dear%20Illumina%20Technical%20Support,%0D%0A%0D%0A)*.* |


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