Thermo Scientific Dionex UltiMate 3000 Series Operating Instructions Manual page 201

Wait until the PistonPositionStatus property reports Operational before you
continue with the next steps.
6. Flush the pump head with seal wash solution (→ step 1 on page 186).
7. To prevent contaminants from entering the HPLC system, thoroughly rinse the pump
(→ page 72).
8. Test the pump for leakage (→ page 211). Tighten leaking connections.
9. Update the service information in Chromeleon (→ page 132).
Operating Instructions
UltiMate 3000 Series:
NCS-3500RS and NCP-3200RS
Page 193