Talks aimed at settling the Brinks Allied dispute ended without resolution last night at the Labour Relations Commission.
ATMs throughout the east coast region have been affected by the dispute over health and safety procedures for the last two weeks.
The dispute has led to the closure of a considerable number of non-branch ATM machines and appears to be no closer to resolution, with both sides saying considerable disagreements remain.
Mr Kevin McMahon, SIPTU security branch secretary, said last night: "We are still engaged in a process with the goal of resuming full services as soon as possible. The talks remain on-going and we are still trying to find an accommodation on the issues."
The banks affected by the dispute have said the level of disruption to customers will not increase over the weekend as they put their contingency plans into operation.
The workers in the company voted on Wednesday to serve formal strike notice on the company by 60 votes to nine.