The filament fails to be loaded into the tool head.
The PTFE tube is not installed correctly.
The gears of the CANVAS are slipping.
Turn the power switch OFF (symbol "|").
Remove the lid.

Check whether the both ends of the PTFE tube are correctly installed.
Note: If any end of the PTFE tube is not installed correctly, the filament cannot feed properly into the tool head.

If the PTFE tube is not installed correctly, re-install both ends of the PTFE tube.
If the PTFE tube is installed correctly, refer to Step 2 for further troubleshooting.
Insert the filament into the upper end of the abnormal CANVAS feeding channel.
Pull out the filament from the lower end and check whether the filament is worn.
