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1) Make sure you have the wires connected to the proper terminals. If you don't have the black wire on the center terminal, it will only throw in one direction.2) IF the above is correct, try switching the terminals for the red and green wires and see if it will throw the other way. If so, that will show that the internal connections are correct.3) Do you have another switch machine that you know works? If so, try using the same button on the switch machine that works to make sure the button is not bad.4) You can also test the machine by attaching the black wire directly to the 16-18 V AC output of your power supply and quickly touching first the red, then the green to the other AC terminal to make sure the switch machine is functioning correctly.If none of the above solve your problem, please contact Don Fidecaro in our service department at dfidecaro@atlasrr.com