Hi Colleen, When the robot stops, you must check the transformer for voltage with a multimeter set to 200vac. To do this, unplug the ROBOT without disturbing the transformer power and simultaneously touch a probe to each spade in the transformer outlet. NO voltage would strongly indicate a bad timer. There are two types of timers, internal and external.
If the transformer is working then a broken wire in the cable could be the culprit. This is diagnosed using the continuity setting on the multimeter.
