# How to restart a sequencer after a power outage?

In the event of a power outage, an Uninterruptable Power Supply (UPS) sustains power to the instrument for a brief period of time. If the UPS fully discharges, or no UPS is connected, the sequencer will lose power and, if there is a run in progress, the run will be aborted.

When the power is restored, follow guidance in the instrument's system guide to power the system back on.

* If the instrument was idle at the time power was lost, no additional actions are needed, provided that the control software initializes successfully.
* If a run was in progress when power was lost, the run terminates, the data and reagents cannot be recovered, and the run cannot be resumed. After powering up the sequencer, perform a manual post-run wash before the next sequencing run.

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| *For any feedback or questions regarding this article (Illumina Knowledge Article #6975), contact Illumina Technical Support* [*techsupport@illumina.com*](mailto:techsupport@illumina.com?subject=Question%2FFeedback%20Regarding%20Illumina%20Knowledge%20Article%20#000006975%20-%20Instrumentation%20\&body=Dear%20Illumina%20Technical%20Support,%0D%0A%0D%0A)*.* |


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