> For the complete documentation index, see [llms.txt](https://help.sbtinstruments.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://help.sbtinstruments.com/troubleshooting/other-problems/flow-cell-does-not-work.md).

# Flow cell does not work

The screen says the flow cell is invalid, obsolete, depleted or removed.

Find the message your BactoBox® shows.

Got an error code during a sample or a QC test instead? See [Error codes](/troubleshooting/error-codes.md).

## *Flow cell removed*

Your BactoBox® does not detect the flow cell.

Press firmly on the top section of the flow cell until it clicks. Then press firmly on the lower section until it clicks again. Once in place, it feels slightly springy when you press the center. See [Install flow cell](/getting-started/installation/install-flow-cell.md).

<figure><img src="https://1589625940-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2FQorx08wID6YNpw8pEV0j%2Fuploads%2Fgit-blob-46757932fdb10c0a43cab682520f18830fad3231%2Fflow-cell--simple-outline--click-into-place.png?alt=media" alt="Press the flow cell into place, top section first, then the lower section." width="375"><figcaption></figcaption></figure>

If the message stays, [contact support](/troubleshooting/contact-support.md).

## *Flow cell invalid*

Remove the flow cell and [install it again](/getting-started/installation/install-flow-cell.md). If the message stays, [contact support](/troubleshooting/contact-support.md).

## *Flow cell depleted*

The flow cell has reached 250 measurements and is locked. The limit protects its factory calibration. Install a new [flow cell](/item-register/consumables/flow-cell.md), and replace the external filter at the same time.

## *Flow cell obsolete*

This flow cell is an old type that your BactoBox® no longer supports. Install a current [flow cell](/item-register/consumables/flow-cell.md).


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