80 Agilent 1200 Preparative Pump User Manual
6 Troubleshooting and Diagnostics
Error Messages
Compensation Sensor Short
The ambient-compensation sensor (NTC) on the main board in the module has
failed (short circuit).
The resistance across the temperature compensation sensor (NTC) on the
main board is dependent on ambient temperature. The change in resistance is
used by the leak circuit to compensate for ambient temperature changes. If the
resistance across the sensor falls below the lower limit, the error message is
generated.
Fan Failed
The cooling fan in the module has failed.
The hall sensor on the fan shaft is used by the main board to monitor the fan
speed. If the fan speed falls below a certain limit for a certain length of time,
the error message is generated.
Probable cause Suggested actions
1 Defective main board. Exchange the main board.
Probable cause Suggested actions
1 Fan cable disconnected. Ensure the fan is connected correctly.
2 Defective fan. Exchange fan.
3 Defective main board. Exchange the main board.
4 Improperly positioned cables or wires
obstructing fan blades.
Ensure the fan is not mechanically blocked.
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