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Please be advised that if the MP 150 is displaying the letter E followed by number 3, this would indicate a paper jam.However, if it is flashing E, then 3 and then another digit, an error requiring servicing might have occurred.Turn Off the machine and unplug the power cord of the machine from the power supply. After a few minutes, plug the power cord of the machine back in and turn On the machine. If the same error occurs, contact a Canon service representative
E3 error on the MP150 is a paper jam error. Make sure that there is nothing obstructing the paper going into the printer and that the feed mechanism doesn't have anyhting in it. Also run a roller cleaning from the printer software.
You have to pull the paper out gently, recheck if ink cartridges are secure. Next you want to reset the printer by pressing Reset for several seconds or unplug it from the wall. This should reset everything.