6,000 psychiatric nurses will resume their ban on working overtime tomorrow.
It's after talks to resolve a dispute between the Psychiatric Nurses Association and the HSE broke down last night.
The dispute centres on the recruitment and retention of mental health staff and has been ongoing for over 5 months.
A spokesperson for Health Minister Simon Harris said he wanted unions to come back to the negotiating table, and try to avoid disruption for patients.
The PNA's Peter Hughes claims the decision to restart the overtime ban is down to the lack of effort from management to resolve the issue.