64 1100 Series Nano Pump Service Manual
2 Troubleshooting and Test Functions
Wait Time-out
When running certain tests in the diagnostics mode or other special
applications, the pump must wait for the plungers to reach a specific position,
or must wait for a certain pressure or flow to be reached. Each action or state
must be completed within the time-out period, otherwise the error message is
generated.
Possible Reasons for a Wait Time-out
• Pressure not reached.
• Pump channel A did not reach the delivery phase.
• Pump channel B did not reach the delivery phase.
• Pump channel A did not reach the take-in phase.
• Pump channel B did not reach the take-in phase.
• Solvent volume not delivered within the specified time.
Probable Causes
• System still in purge mode.
• Leak at fittings, EMPV, active inlet valve, outlet ball valve or plunger seals.
• Flow changed after starting test.
• Defective pump drive assembly.
Suggested Actions
✔ Ensure that purge valve is closed.
✔ Exchange defective capillaries.
✔ Ensure pump components are seated correctly. If there are still signs of a
leak, exchange the appropriate seal (active inlet valve, outlet ball valve,
plunger seal).
✔ Ensure correct operating condition for the special application in use.
✔ Exchange the defective pump drive assembly.
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