The dispute at Otis Lifts may escalate, according to the union involved, the TEEU.
The row centres on 17 lift engineers who were made redundant at the end of June.
The dispute affects a number of facilities in Dublin including shopping centres, banks and the new terminal at Dublin Airport.
Meanwhile, a 24-week long strike by staff at Pickerings Lifts which affected over 400 tenants at Ballymun, has ended.
It follows negotiations involving an independent mediator.