1100 Series Nano Pump Service Manual 43
Troubleshooting and Test Functions 2
Valve Failed
Valve 0 Failed: valve A1
Valve 1 Failed: valve A2
Valve 2 Failed: valve B2
Valve 3 Failed: valve B1
One of the solvent selection valves in the nano pump failed to switch correctly.
The processor monitors the valve voltage before and after each switching
cycle. If the voltages are outside expected limits, the error message is
generated.
Probable Causes
• Solvent selection valve disconnected.
• Connection cable (inside instrument) not connected.
• Connection cable (inside instrument) defective.
• Solvent selection valve defective.
Suggested Actions
✔ Ensure the solvent selection valve is connected correctly.
✔ Ensure the connection cable is connected correctly.
✔ Exchange the connection cable.
✔ Exchange the solvent selection valve.
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