Canon GM2000 Series Online Manual page 349

1432
Cause
Print head cannot be recognized.
What to Do
A print head may not be installed properly or may not be compatible with this printer.
If you are printing, press the printer's RESUME/CANCEL button to cancel printing.
Remove the print head and reinstall it properly following the steps below. This may resolve the error.
1. Open top cover.
2. Close ink valve.
Tilt the ink valve lever tightly to the left.
349