Is Error 5100 a serious problem for the Canon G1010, and can it be fixed by a user?

Error 5100 is considered a moderately serious problem as it prevents the printer from functioning. While it often indicates a hardware issue, it can frequently be resolved by the user through basic troubleshooting steps like checking for obstructions, power cycling, and ensuring components are properly seated. However, if the error is due to a faulty print head, main board, or a more complex mechanical failure, professional service or part replacement might be necessary, which may exceed the cost-effectiveness for some users.