NATE Gas & Oil Heating Systems Practice Test 2025 – Complete Exam Prep

When the indoor blower motor runs but frequently cycles on an internal overload protector, it often indicates that the motor is experiencing issues such as overheating or being overloaded. In such situations, measuring the voltage across the motor's run capacitor provides important diagnostic information.

When a technician measures across the run capacitor, they are assessing whether it is functioning properly. A correctly functioning capacitor should show a certain voltage rating when measured, which is typically close to the rated voltage of the capacitor itself. If one technician claims that the capacitor is performing within spec, and another claims it is not, the one who is measuring accurately according to the manufacturer’s specifications is the one who is correct.

In this scenario, it is essential that the technician's methodology and understanding of how to read the capacitor's voltage is accurate. If their reading aligns with what is expected based on the motor's operational characteristics, then that technician's assertion is valid.

Thus, if Tech A has provided a reading that indicates proper function based on the operational parameters of the capacitor while Tech B has not, Tech A's reading would correctly indicate the capacitor's effectiveness in supporting the blower motor's operation, making Tech A the one whose measurement is correct.