My KH Director has worked well since I bought it, but a few days ago the test reading said 0.0 dKH.

I have calibrated everything and everything is perfect with the Doser 2.1, it works manually or when I use the software for each pump.

Pump 1 = water
Pump 2 = reagent
Pump 3 = waste water

Observing what happens when I click on "star measurement now", pump 1 works normally, it supplies water to the KH Director, then pump 3 takes out the water and pump 1 reloads the water to start the test, up to here everything is normal, what happens then is that instead of starting pump 2 to put the reagent in, it does not do it, as soon as pump 1 ends, pump 3 drains the water again and when it ends the "Status" says: measuring, then it changes to OK as if the test was performed correctly, but pump 2 never added the reagent and the test result is 0. 0 dKH. Does anyone know what happens?