# How to troubleshoot CIB Fault Initialization errors on the NovaSeq X/X Plus

The NovaSeq X Series Control Software will verify a stable connection to the Camera Interface Board (CIB) during initialization. This results in one of three outcomes:

1. The CIB responds as expected, and initialization will proceed normally.
2. The CIB times out or is in a bad state, but the Software automatically recovers the connection.
3. The CIB times out and the Software is not able to recover the connection.

**If the CIB Fault is recovered automatically**

If the CIB times out or is in a bad state, the NovaSeq X Series Control Software will automatically attempt to recover the CIB connection. If this recovery attempt is successful, the following error will be displayed.

![](https://761066130-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2FGM9W2DuBTgEXv1ClCm8H%2Fuploads%2Fgit-blob-9a6d5aba604eaf0e69b323eadd51139bf3a83d3a%2Fimage1.png?alt=media\&token=f4816037-c016-401c-bbff-3f1b335ff4d4)

If this error presents, see the following Troubleshooting Actions:

1. **Do not** shutdown or power cycle the instrument.
2. Select **Exit Application** and restart the NovaSeq X Series Control Software.
3. If initialization is successful, proceed with normal instrument workflow.

**If the CIB connection does not recover automatically**

If the Control Software is not able to recover the CIB connection, it will interrupt software initialization with the following error.

![](https://761066130-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2FGM9W2DuBTgEXv1ClCm8H%2Fuploads%2Fgit-blob-fba12f3761b7f656b63f16825c6c79770827f76a%2Fimage2.png?alt=media\&token=8526e12e-c187-4ace-b45b-88bd6eaec97f)

If this error presents, see the following Troubleshooting Actions:

1. **Do not** shutdown or power cycle the instrument.
2. Select **Exit Application** and restart the NovaSeq X Series Control Software.
   1. If initialization is successful, proceed with normal instrument workflow.
   2. If the error persists, repeat Step 2 up to two additional times.
3. If the issue persists after three attempts to restart the NovaSeq X Series Control Software, contact [Illumina Technical Support](https://www.illumina.com/company/contact-us.html).

\
\
\ <br>

|                                                                                                                                                                                                                                                                                                                                                                        |
| :--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------: |
| *For any feedback or questions regarding this article (Illumina Knowledge Article #7819), contact Illumina Technical Support* [*techsupport@illumina.com*](mailto:techsupport@illumina.com?subject=Question%2FFeedback%20Regarding%20Illumina%20Knowledge%20Article%20#000007819%20-%20Instrumentation%20\&body=Dear%20Illumina%20Technical%20Support,%0D%0A%0D%0A)*.* |