Troubleshooting Z motor errors occurring mid run on the MiSeq
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A Z motor error occurring mid-run can be caused by instrument fluidics, debris, smudges on the flow cell, or library overclustering issues.
ERROR: While trying to find focus, the Z stage has attempted to move outside its acceptable range.
Troubleshooting steps:
Confirm reagent kits were not expired at the time of the run.
Confirm the quality and quantification of the library were as expected and were checked in accordance with Illumina-recommended methods.
Contact with the following run files to review the library performance.
From within D:\Illumina\MiSeqTemp<run folder>, send: InterOp folder RunParameters.xml RunInfo.xml Thumbnail_Images\L001\C1.1 (cycle 1)\* \*Send cycles 1-10 and the last 10 cycles before the run failed.
Power cycle\* the instrument.
If the instrument initializes successfully, perform a System Check on the instrument.
If the system check passes and Technical Support does not suspect a library-related issue, proceed with setting up the next run.
If Z motor error recurs in the subsequent run, contact .
For further information, search for the following Knowledge Base articles:
*\How to Shut down or power cycle the MiSeq.
*\How To Power Cycle the MiSeq Video.
System checks on Miseq.
For any feedback or questions regarding this article (Illumina Knowledge Article #1850), contact Illumina Technical Support .