Hi. I have a problem with manual measurement.
The measurement result screen indicates 0.0 dKH
Before making the measurement I start the preparation maintenance process: I press the "Vent Internal Flush" button and then I press the "Flush Measuremnet cell ..." button.
After this, I press the "Start Measurement Now" button
The status box says: "measuring"
Pump # 1 (Sample Water) starts operation, after a while it stops. Pump # 3 (Waste Water) starts operation and after a while it stops. Pump # 1 starts operation again and then stops, again, pump # 3 starts operation and then stops and finally pump #1 starts operation in reverse mode and stops. Pump # 2 (Reagent Fluid) never started operations and The status box changed from "measuring" to "ok" and the result screen remains 0.0 dKH
Any idea?

My firmware is 1.28

Thanks