1100 Series Nano Pump Service Manual 51
Troubleshooting and Test Functions 2
Encoder Missing
Encoder Missing: Pump channel A
B: Encoder Missing: Pump channel B
The optical encoder on the pump motor in the nano pump is missing or
defective.
The processor checks the presence of the pump encoder connector every 2
seconds. If the connector is not detected by the processor, the error message is
generated.
Probable Causes
• Defective or disconnected pump encoder connector.
• Defective pump drive assembly.
Suggested Actions
✔ Ensure the connector is clean, and seated correctly.
✔ Exchange the pump drive assembly.
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