It's very unusual that 3 motors would go bad at the same time. I'd be more inclined to suspect the controls. Also, it's possible that if the unit is supplied by 240 volts that you may have lost one leg. Losing one leg could still enable the controls, since they are usually 120 volt, but none of the motors would run if they are 240 volt.
You can disconnect the motors and try to run them from a temporary line, too. Might save you some $.