Settings for dosing pumps are

Pump1 water sample speed 3, 38ml/m
Pump 2 reagent speed 0, 4.1ml/m
Pump 3 waste speed 3, 34.2ml/m

Sample line is 135.9cm, 11.9 for dosing head tube, 16 for connecting the doser to khd, and 108 for tube from sump to doser. No water filter is attached and the sample tube volume is 17ml

I have sat in front and pumps all spin normally

I am using the GHL probe just tried a different one to see if it'd make any difference.
Am using GHL calibration fluids 4 and 7