The union representing hospital support staff says it has been vindicated by a decision that allows its members to continue work bans.
Staff are refusing to clear empty meal trays, move linen or sterilise equipment at privatised hospitals in protest over a $28 a week pay rise offered by the State Government.
Carolyn Smith from United Voice says the Health Minister has failed in his bid in the Western Australian Industrial Relations Commission to force staff to resume their full workload.
"The Government was seeking orders because they were saying that our members weren't bargaining in good faith," Ms Smith said.
"The Commissioner didn't accept that and refused to issue orders stopping the industrial action." Ms Smith said the union will continue to negotiate with the Government in good faith.
"Our work bans are continuing indefinitely," she said.
"We're beginning negotiations again with the Government on Monday and we're hoping they're going to put a better offer on the table in terms of wages and in terms of privatisation." The Health Minister has been contacted for comment.