The latest employment offers from the Ministry of Education have been rejected by primary teachers and principals.
New Zealand Educational Institute (NZEI) Te Riu Roa members took part in a secret ballot which closed on Tuesday night.
Further strike action is now back on the table, two months on from a nationwide strike in August.
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"Teachers and principals are saying that they are disappointed by the Government's failure to deliver and they are resolute in their determination," NZEI Te Riu Roa President Lynda Stuart said.
"The Government keeps saying we have to be patient, and they can't fix everything at once, but the teacher shortage is at crisis point. If you think it's expensive trying to fix a crisis, just wait to see how hard it is to turn around a disaster. In the meantime, our students' learning suffers when we can’t even find relievers to cover for sick teachers."
Primary teachers and principals' next moves will be decided at the NZEI Annual Conference in Rotorua this weekend. If strike action is recommended, members will vote early next term on whether to take it.
Listen to the full interview with Lynda Stuart above.