Printing never starts because target temperatures are set to zero

[odrobnik]

I've encountered several times this issue:

• I do several prints, some via WiFi transfer from Luban. Then possibly one or more repeat where I select a model directly on the touch screen
• the print looks like it gets started, but the target temperature for the nozzle and heated bed remain at 0

Since zero cannot ever be reached (because room temperature is much higher than that, my bed might have around 20 degrees C even when not heated), nothing happens until I power-cycle the machine.

[scotthsl]

Sorry for the trouble, this is a known bug in firmware V1.10.1 (corresponding Controller version is V3.2.2).

When the printing head is heated from over 100°C, it may trigger the "heat failure" protection mechanism, and then the controller actively turns off the heat.

This problem will be solved in the new firmware version, the temporary solution is to let the print head cool down to room temperature before heat up again.