The staff committee issued a press release, in which they outlined their grievances.
"For more than five years, we have fought to ensure that our teachers are fairly compensated for the increasingly tough conditions, and want them to have better working conditions. Downtime is no longer accepted," trade union chairman Hans Auer said.
A collective package had been previously negotiated with the responsible minister, Tina Widmann, but after the change in government in 2013, there were no improvements.
Envisaged in the package was a better salary for existing teachers, plus a new salary scheme for new employees, and more preparation time for teachers.