> 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/dilution-dispenser-acting-up.md).

# Dilution dispenser acting up?

## What may happen to your dilution dispenser

### Piston is stuck

If you cannot push down the piston do not apply force!

It is likely that one or both of the internal ejection valves are jammed.

To resolve this issue, please consult the Instructions Manual included with the device, especially section 13 on general trouble shooting and section 10 on how to remove the valves from the device. Possibly you don't need to replace them, just clean them and make sure they move freely.


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