The International Union of Elevator Constructors Locals 96, 90 and 50 began strike action Wednesday.
The three locals in Ontario went on strike — for the first time in over 20 years — after negotiations folded early Wednesday morning.
Pickets have been set up at various locations.
The union says the employer has agreed to a pay hike but will not budge on other issues including overtime pay and travel time.
Managers who are licensed will be brought in to do any repair work.