Canon e470 series PG47 cartridge refilling ||
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Refilling the ink cartridge is an invasive procedure where you inject ink into the cartridge with the help of a syringe. Care has to be taken to ensure that the injected area is sealed so that there is no circulation. When this area comes in contact with air, ink starts clotting and that is not a very welcome thing to happen.
The contact points could be damaged or smudged. Clean them and attempt reinserting the cartridge into the printer. Restarting the printer is also another proven technique that is known to rectify this problem.
Restarting can be done by keeping your printer turned on and removing the power cords and reconnecting them after a period of 60 seconds. The printer will automatically turn on, failing to do so will require you to press the power button to assist with the same. The error should be cleared. Let us know the results