G6020 maintenance: check ink and the nozzle pattern before Ink Flush
Canon’s G6000 series manual explicitly includes the G6020 and describes it as a refillable tank printer. That distinction changes the service path: its cleaning controls act on an ink-tube and printhead system supplied from tanks, not on disposable FINE cartridges. The maintenance procedure starts with a nozzle pattern and staged head cleaning. Ink Flush is a separate, high-consumption operation that Canon warns should be performed only when necessary and only after checking every tank level.
If one color is weak or absent, the next decision should come from the pattern and the tank level, not from a guessed button sequence. A clean pattern means Ink Flush is not a printhead remedy. If the pattern is defective, perform only the earlier cleaning steps Canon lists; then reassess. An Ink Flush takes about eight minutes and cannot be interrupted. Before choosing it, ensure the G6020 has enough ink in every color and that the fault matches the conditions Canon’s service material describes.
Confirm the G6020 family and current ink supply
Canon’s online G6000 manual lists the G6020 among supported models. Its ink reference specifies GI-20 bottles, with a separate pigment black bottle and cyan, magenta and yellow colors. Read the tank indicators before maintenance. The G6000 page says to refill any color below its single-dot level before an Ink Flush. Do not import GI-21 instructions from G3270/G3272 or PG/CL cartridge procedures from TR/TS machines; the model names look like one G family but their supply numbers differ.
Establish the symptom with a nozzle-check sheet
Canon recommends maintenance when output is blurred, colors are missing or ruled lines do not align. Print the G6020 nozzle check and inspect each color block. Note which color has gaps, whether black is affected, and whether the pattern is complete. If it is normal, the defect may be in paper choice, application settings, driver processing or the source file; a head-cleaning cycle would consume ink without addressing those causes. Keep the sheet so each subsequent maintenance step can be compared with the baseline.
Run the prescribed cleaning sequence and stop to inspect
Canon’s G6000 maintenance procedure is explicit: print and examine a nozzle-check pattern; if it has missing lines or horizontal white streaks, run Cleaning and print another pattern. If the issue remains after repeating the pattern/cleaning steps twice, run Deep Cleaning and inspect again. If still defective, turn the printer off without unplugging it; wait 24 hours, run Deep Cleaning again, then inspect the pattern. Only if the defect remains does Canon instruct Ink Flush. Check every tank first and refill any below the single-dot level. If the pattern is still wrong after Ink Flush, check printhead installation. Do not rinse or wipe the head.
Understand what Ink Flush does and why the level check matters
Canon says Ink Flush consumes a great amount of ink and frequent flushes can rapidly use the supply. Check all tank levels and refill any color below the single-dot mark before starting. The G6000 menu path is Setup > Maintenance > Ink Flush; select all colors, color, or black as indicated by the displayed choices and confirm the prompts. Canon says the operation takes about eight minutes and the printer should not be operated during it. This is the late step in Canon’s pattern-led sequence, not a substitute for the two ordinary Cleaning attempts, Deep Cleaning, and the 24-hour wait/repeat step.
Do not confuse tank maintenance with replacing a cartridge
The G6020’s bottles replenish internal tanks; they are not snap-in PG/CL cartridges. Canon’s GI-20 reference is the correct consumable lookup for this family. Do not remove tubing or attempt to inject ink directly into the printhead. If a tank appears full but the pattern remains wrong, record that fact and the maintenance performed. A tank reading and a printhead pattern describe different parts of the ink path, and a mismatch between them may require Canon’s next supported action rather than another bottle refill.
Use the result to decide whether to continue or request service
After the allowed cleaning/flush sequence, print another nozzle-check pattern. Compare the exact affected sections with the baseline, and note whether the printhead is misaligned, a color remains absent, or output improved. If a normal pattern returns, stop maintenance and print a small test job. If the defect persists after the documented steps, provide Canon service the model name, pattern sheets, ink levels, error messages and exact sequence completed. Avoid repeating Ink Flush as a general fix; it can consume significant ink without identifying a failed part.