Check the Waste Toner Bottle (WTB) located at the rear right side of the printer.
Give a few good taps to allow the waste toner to settle normally in the bottle.
Remove the waste toner bottle if the warning message remains.
Note: The WTB can possibly have excess toner which could cause a mess, make sure to place a paper under the WTB before performing this step.
Gently tap the waste toner bottle on the table with a right side up position.
Note: The WTB can possibly have excess toner which could cause a mess, make sure to place a paper under the WTB before performing this step.