"I went to see mutual respect, I want to see dignity maintained by both parties," he said.
Health board chief executive Julie Patterson said the decision had already been made by Minister for Land Information Maurice Williamson who indicated he expected Crown agencies to move towards using Whanganui over Wanganui.
Kate Joblin said the board needed to "get on with it" and put in the "H".
Chairwoman Dot McKinnon was also in support of the motion. "We service the whole region - the whole region is 'Wh'," she said.
Ray Stevens told the Chronicle he was going to be "consistent" and that the board's decision last year was still appropriate.
The change is expected to be introduced incrementally because signage needs to be replaced and completed by December 31 next year.