The man had been on trial at the Auckland District Court, pictured.

The trial of an actor accused of sexually assaulting his acting students has been terminated just two days into the evidence.

The man, who can't be named, has pleaded not guilty to 10 charges of indecent assault and two of sexual violation by unlawful sexual connection.

The charges relate to four women who took the man's private acting tutorials between 2010 and 2013.

A jury was selected on Monday and the trial opened on Wednesday with two complainants giving evidence that the man had kissed and touched them during the lessons.

On Friday morning the jury of 12 was told by Judge David Sharp that the trial had to be aborted.

The reasons for the termination are suppressed.

"It's nothing to do with anything you have done or anything either counsel have done," Judge Sharp told the jury.

"I can't tell you the entire reason for having to terminate the trial but it's matters that need to run their course, and the trial will have to go on in the future."

A further hearing to consider whether the man's name suppression will continue will be held next week.