1100 Series Nano Pump Service Manual 41
Troubleshooting and Test Functions 2
Pressure Below Lower Limit
The system pressure has fallen below the lower pressure limit.
Probable Causes
• Lower pressure limit set too high.
• Air bubbles in the mobile phase.
• Leak.
• Defective damper.
• Defective CSM board.
Suggested Actions
✔ Ensure the lower pressure limit is set to a value suitable for the analysis.
✔ Ensure solvents are degassed. Purge the nano pump.
✔ Ensure solvent inlet filters are not blocked.
✔ Inspect the pump head, capillaries and fittings for signs of a leak.
✔ Purge the nano pump. Run a pressure test to determine whether the seals
or other pump components are defective.
✔ Exchange the damper.
✔ Exchange the CSM board.
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