Gas Heat ESCO Practice Exam

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What does it mean when a technician reads infinity between the high and low speed wires on a 120 VAC furnace motor?

  1. Blower motor's normal operation

  2. Normal winding resistance

  3. Open winding

  4. Winding continuity

The correct answer is: Open winding

When a technician reads infinity between the high and low speed wires on a 120 VAC furnace motor, it indicates an "open winding." This means that there is a break in the circuit within the motor winding, preventing the flow of electricity and resulting in an open circuit. This issue would need to be addressed by repairing or replacing the motor to restore proper functionality. The other options are incorrect: A. This is not the blower motor's normal operation. B. Normal winding resistance would show a specific resistance value, not infinity. D. Winding continuity would show a specific resistance value, not infinity.

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