1100 Series Nano Pump Service Manual 31
Troubleshooting and Test Functions 2
Leak
A leak was detected in the nano pump.
The signals from the two temperature sensors (leak sensor and
board-mounted temperature-compensation sensor) are used by the leak
algorithm to determine whether a leak is present. When a leak occurs, the leak
sensor is cooled by the solvent. This changes the resistance of the leak sensor
which is sensed by the leak-sensor circuit on the CSM board.
Probable Causes
• Loose fittings.
• Broken capillary.
• Loose or leaking active inlet valve, outlet ball valve, or EMPV.
• Defective pump seals.
Suggested Actions
✔ Ensure all fittings are tight.
✔ 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).
✔ Exchange the pump seals.
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