Hi Ian,
“Nozzle purge” is a internal feature installed in WAZER. Please go to “setup and Maintenance” > “maintenance” > “nozzle purge”.
Follow the instruction on the screen to initiate the purge. Please ensure to remove the abrasive hose from the nozzle while doing so. Press the “start” button to engage the nozzle purge, not the “okay” button.
The machine will attempt to engage the high pressure system for 3 short bursts and 1 long burst. During this time, you will be able to run the checks identified above.
If you encounter any more issues, please contact WAZER support at support@wazer.com
Thank you,