Hi wandasf,
The 1686 error indicates that your color ink cartridge may have run out of ink. If you would like to continue printing or faxing until you are able to replace the ink cartridge in the unit, you can disable the ink level detection function of the printer by pressing and holding down the STOP/RESET button the printer for at least 5 seconds, then releasing it. Once the ink cartridge is replaced with a Canon genuine ink cartridge, the ink level detection function of the printer will be re-enabled.
Hope this helps!
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