1100 Series Nano Pump Service Manual 49
Troubleshooting and Test Functions 2
Temperature Limit Exceeded
Temperature Limit Exceeded 0: Pump channel A
Temperature Limit Exceeded 1: Pump channel B
The temperature of one of the motor-drive circuits is too high.
The processor continually monitors the temperature of the drive circuits on
the CSM board. If excessive current is being drawn for long periods, the
temperature of the circuits increase. If the temperature exceeds the upper
limit of 95 ºC, the error message is generated.
Probable Causes
• High friction (partial mechanical blockage) in the pump drive assembly.
• Partial blockage of the flowpath in front of the damper.
• Defective drive assembly.
• Defective CSM board.
Suggested Actions
✔ Ensure the capillaries and frits between the pump head and damper inlet
are free from blockage.
✔ Ensure the outlet valve is not blocked.
✔ Remove the pump head assembly. Ensure there is no mechanical blockage
of the pump head assembly or pump drive assembly.
✔ Exchange defective drive assembly.
✔ Exchange the CSM board.
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