46 1100 Series Nano Pump Service Manual
2 Troubleshooting and Test Functions
Valve Fuse
Valve Fuse 0: Channels A1 and A2
Valve Fuse 1: Channels B1 and B2
One of the solvent-selection valves in the nano pump has drawn excessive
current causing the selection-valve electronic fuse to open.
Probable Causes
• Defective solvent selection valve.
• Defective connection cable (front panel to CSM board).
• Defective CSM board.
Suggested Actions
✔ Restart the nano pump. If the error message appears again, exchange the
solvent selection valve.
✔ Exchange the connection cable.
✔ Exchange the CSM board.
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