Press enter to stop at exactly 250 ml.
Repeat the calibration for all of the pumps.
If the pumps are not calibrated they will not run even if there is an amount programmed.
If the calibration time for each pump is longer than 52 seconds for 250 ml (50 seconds for 8 oz.) this indicates
that the pump outlet is 25% below rated flow rate. In this case it is recommended to increase the supply tube
inlet size to avoid wear out on the tube.