When a Canon printhead begins to fail the printer often shows an error code 1403 that can mean the printhead is overheating. This makes more sense than the printhead being a wrong type. When a Canon printhead fails the error is often intermittent in the beginning and later becomes permanent. There is no way you can reset the error code. But as the error sometimes is intermittent, strange procedures from the web sometimes seem to work.
If you are very lucky the error is caused by dirty contact pads on the printhead or dirty contact springs in the printhead carriage. Try cleaning them with Isopropyl Alcohol or an electronics contact cleaner.
A damaged printhead can prevent the printer form turning on and if you are unlucky it can also damage the main board. A mainboard damaged by a defective printhead can ruin a new printhead. In many Canon service manuals it is recommended that both the printhead and the main board is changed at the same time. So replacing a Canon printhead is a gamble and I cannot tell your odds for success.
I recomment you stop using the printer and remove the printhead while the printer can still turn on. It looks like you are located in Germany, so here is the printhead from a German supplier. Don't buy cheap printheads from the far East. They are used and often defective printheads that have been cleaned to look like new and repackaged in fake foil bags and cardboard boxes.