Dilution dispenser is stuck

The piston of the dilution dispenser does not move.

You cannot push down the piston on your dilution dispenser.

Do not force the piston.

One or both valves inside the dispenser are most likely stuck. Often it is enough to clean them, so they move freely again.

See the instruction manual that came with the dispenser. Section 10 shows how to remove the valves, and section 13 covers troubleshooting.

Still stuck? Contact support.