Some students who sat NCEA exams on computers last year were mistakenly given fail grades, the Qualifications Authority says.
It said students who received a zero result for any of the digital pilot exams should talk to their teachers.
The Level 1 and Level 2 exams were offered in Classical Studies, English, and Media Studies.
The authority said the error was not picked up in random marking checks.
It was reviewing the zero results and correcting students' records in cases where marks should have been allocated.