"In part this was caused by demands on his time from principal organisations, MOE [Ministry of Education] and government groups. He has apologised to the board that those circumstances resulted in a breakdown in relationships."
The statement added the board had agreed to accept Mr Witana's resignation and withdrew its decision to dismiss him.
It also stated that "the board and Peter Witana have always acted in the best interests of the school".
Board of trustees chairman Roger Dephoff said Liz Ross, former deputy head at Ohaeawai School, was continuing as acting principal until a permanent appointment was made. Applicants for the position had been narrowed down to a shortlist.
It was hoped a new principal would start next term.
Meanwhile, the school was planning a building beautification programme and an expansion of e-learning and IT initiatives.