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Troubleshooting and Test Functions
Leak
Leak
A leak was detected in the quaternary 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 LPM board
Probable Causes • Loose fittings.
• Broken capillary.
• Loose or leaking purge valve, active inlet valve, or outlet ball valve.
• 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 (purge valve, active inlet valve, outlet
ball valve).
❏ Exchange the pump seals.