58 1100 Series Nano Pump Service Manual
2 Troubleshooting and Test Functions
Pump Head Missing
Pump Head Missing: Pump channel A
B: Pump Head Missing: Pump channel B
The pump-head end stop in the nano pump was not found.
When the nano pump restarts, the metering drive moves forward to the
mechanical end stop. Normally, the end stop is reached within 20 seconds,
indicated by an increase in motor current. If the end point is not found within
20 seconds, the error message is generated.
Probable Causes
• Pump head not installed correctly (screws not secured, or pump head not
seated correctly).
• Broken plunger.
Suggested Actions
✔ Install the pump head correctly. Ensure nothing (e.g. capillary) is trapped
between the pump head and body.
✔ Exchange the plunger.
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