Description: In switchbacking of paper for printing on the second side, a recording paper jam has occurred. (The paper feed sensor does not come ON even after the recording paper is fed for the specified paper feeding amount.)
Code: 20
Description: Cannot identify a black ink cartridge. (The sensing timing of the ink remaining sensor, ink cartridge detection sensor and high-yield ink cartridge sensor is off.)
Code: 21
Description: Cannot identify a yellow ink cartridge. (The sensing timing of the ink remaining sensor, ink cartridge detection sensor and high-yield ink cartridge sensor is off.)
Code: 22
Description: Cannot identify a cyan ink cartridge. (The sensing timing of the ink remaining sensor, ink cartridge detection sensor and high-yield ink cartridge sensor is off.)
Code: 23
Description: Cannot identify a magenta ink cartridge. (The sensing timing of the ink remaining sensor, ink cartridge detection sensor and high-yield ink cartridge sensor is off.)
Code: 24
Description: An ink cartridge of wrong color is loaded. (A color ink cartridge is loaded in the black ink cartridge slot.)