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? EL-0007

Correct Answer: Option A — an open stop switch contact (when not pushed in)

Voltage between 1 and 5 indicates line potential is present at the start of the control circuit. A reading of 0 VAC between 2 and 5 confirms an open circuit exists before point 2. The stop switch, being a normally closed device, is the primary component interrupting continuity in this sequence.