@infiniteloop Try it your solution, but for whatever reason it doesn't work. At the startup the pump starts.
RepRapFirmware for Duet 2 WiFi/Ethernet
Firmware Electronics: Duet WiFi 1.02 or later
Firmware Version: 2.03 (2019-06-13b2)
WiFi Server Version: 1.23
Web Interface Version: 1.22.6
Not a big problem,
Thank you for taking time to answer and help.