215. In the illustrated motor controller, the motor fails to start. A voltmeter reading between 1 and 5 reads line voltage, while the voltmeter reading between 2 and 5 reads 0 VAC. What is most likely the problem

A voltmeter reading line voltage between points 1 and 5, and 0 VAC between points 2 and 5, indicates an open stop switch contact. This prevents point 2 from reaching line voltage, causing it to share the potential of point 5, resulting in the observed 0 VAC reading and preventing motor startup.