After calibrating the pH probes and measuring out the tubing, a well as enabling the KHD, when I press the [flush measurement cell] on the GHL connect app, nothing happens.

The KHD land the dosing pump top led lights are blinking white.

The led lights next to the KHD PAB cable the state is green and the com is lit yellow, while the doser led lights next to the PAB cable the state is green but the com is NOT illuminated.

I suspect this is my issue but again, I can’t figure out how to work this out.

Thanks