Credit to “u/Deadtobealive” on Reddit . . . here’s my “edited for clarity” version of his post after getting my 5B00 error cleared followed by getting the black ink to run through the tubes again without bubbles (March 2022) on my Canon G3200 printer:
Start by putting the printer into service mode:
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(Service mode)
-- Turn Printer Off
-- Press and HOLD the Stop button (red Triangle - keep holding until release *)
-- Press and HOLD Power button (keep holding until release *)
-*- Release the Stop Button
-- Press the stop button 5 times
-*- Release the Power button
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(Waste Ink Counter WIC Tank Reset clearing error code 5B00)
-- While in service mode
-- Press the Stop button 5 times
-- Press the Power Button once
-- -- wait -- for it to reset followed by a single page to run through the printer --
-- Press the Stop button 3 times
-- Press the Power Button once
-- -- wait -- for it to reset followed by a single page to run through the printer --
-- Turn off the printer
-- Turn the printer back on & the 5B00 code should be cleared
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(Air Bubbles in Ink Tubing)
-- Turn on the printer (normal startup)
-- Press and hold the stop button for about 5 seconds: watch for 5 flashes and then release
-- -- the printer will run through an extended cycle, use a lot of ink & dump a lot into the waste ink tank
https://www.reddit.com/r/printers/comments/e5mwb0/canon_g_series_reset_page_counter_for_ink/