What action will cause the nozzle height back to 0mm?

1. In the software, if you choose “Reset to Default”, the software will reset the main parameters back to the factory settings: Printer Name, 9-point bed leveling offsets, nozzle height set to 0, the value of nozzle offset, print material and the weight set to default values.

You can find the “Reset to Default” option by going to Settings, select Printer, choose the Printer, and click Reset to Default.

2. The software version is not compatible with the printer.