Are there any preventive measures to avoid Error 5200 on a Canon G3020 in the future?

To prevent Error 5200, always keep your ink tanks filled above the minimum line to avoid air getting into the lines and to ensure the print head has sufficient ink for cooling. Avoid letting the printer sit idle for extended periods; print a test page weekly. Use genuine Canon ink, and always allow the printer to complete its proper shutdown cycle by pressing the power button rather than directly unplugging it.