Flushing the pipette tips is a good way to assess that they air bubbles are out of the lines everything is working well. Here are steps on how to build a flushing macro using the “Build Macro” page (introduced here), which will be saved as a custom macro. Generally, the steps involved are as followed:

1. Move 4-way valves to bypass
2. Move pipettes to waste station
3. Move 4-way valves to input
4. Load multichannel syringes with 500 microliters
5. Turn on waste pump
6. Move 4-way valves to output
7. Dispense 500 microliters
8. Dry pipette tips
9. Turn off waste pump

Here is a video that explains how to compile the macro.

Here is the macro code.

//valve-1_1_1_1_1_1_1_1-valvebypass
valve-1_1_1_1_1_1_1_1-bypass
//motion waste station zh 0 row 1 F3000
G1Z0F3000
G1X235.5Y24F3000
G1Z12F3000
//valve-1_1_1_1_1_1_1_1-valveinput
valve-1_1_1_1_1_1_1_1-input
//syringe 500 speed 40 acc 20
sg1e500s40a20_17
G1Z12F3000_2
//waste 2 on
wasteon
//valve-1_1_1_1_1_1_1_1-valveoutput
valve-1_1_1_1_1_1_1_1-output
//syringe 0 speed 40 acc 20
sg1e0s40a20_17
//valve-1_1_1_1_1_1_1_1-valvebypass
valve-1_1_1_1_1_1_1_1-bypass
//just dry function
touchdry Z9.5F3000ZT0T0.1
//waste 2 off
wasteoff

Here is video showing the process