"We made it clear to the employers that if an offer was made that honoured the Employment Relations Authority report, we would recommend it to our members," PSA organiser Will Matthews said.
"Yet what we have received today is a kick in the guts. To blatantly disregard the ERA facilitators' recommendations is not only a moral failing, but an act of bad faith."
The ERA recommendations have been confidential, with only the negotiating teams able to see them, Matthews said.
The district health boards had refused their requests for the recommendations to be released, he said.
The PSA wanted negotiations to be handed over to Health NZ and the interim agency "as we have lost confidence in the Ministry of Health".
Health NZ, announced by the Government earlier this year, will take over the planning and commissioning of services and the functions of the existing 20 district health boards, with the Ministry of Health focused on police, strategy and regulation.
Without a guarantee of fair pay, allied health workers would again vote on sustained strike action through June and beyond the establishment of the new Health NZ, Matthews said.
Monday's strike comes after more than 18 months of negotiations between the parties for a new collective agreement including, from Monday this week, work-to- rule plans where staff refused to work more than their contracted hours, and took all breaks they're entitled to.