Gas Heat ESCO Practice Exam

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When a low speed wire on a 120 VAC furnace motor reads 0 ohms, what should a technician conclude?

  1. The motor is working normally

  2. The speed setting is incorrect

  3. The winding is shorted

  4. The wires are disconnected

The correct answer is: The winding is shorted

If the technician were to conclude that A is the correct answer, they would be incorrect. A low speed wire reading 0 ohms in a 120 VAC furnace motor indicates that there is a short circuit in the winding. This means that there is an unintended connection between two points of the circuit, causing the wire to have extremely low resistance. Choosing option B would also be incorrect, as the issue is not with the speed setting but with the internal wiring of the motor. Option D can also be eliminated as the wires are not disconnected, but rather shorted. Therefore, the only correct conclusion that a technician can make is that the winding is shorted and needs to be repaired or replaced.

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