6-thousand members of the Psychiatric Nurses' Association will begin an overtime ban today in a dispute with the HSE.
15 mental health facilities across the country are being affected by a psychiatric nurses overtime ban, which came into effect earlier.
The HSE says it will have a significant impact on services, and it's monitoring the situation closely.
The Psychiatric Nurses Association is staging the indefinite action as it claims there's been a lack of progress in talks with the HSE over pay and working conditions.
The Health Minister says the action is "not on" and must be called out.
Wicklow TD Simon Harris wants both sides to return to the Workplace Relations Commission