When checking the resistance of the compressor start winding, a multimeter shows 3.1 Ω. This indicates:

• A. The winding has continuity and is good
• B. The winding is open
• C. The winding is shorted
• D. The measurement is inconclusive

Answer: (A)

Measuring the start winding’s DC resistance checks that there is a continuous path through the winding. A reading of 3.1 ohms shows there is a closed circuit and the winding is not open, so current can flow through it. That indicates the winding is intact from a continuity standpoint.

If the winding were open, you’d see infinite resistance, which would mean no current could flow. If there were a short, you’d typically see an abnormally low resistance or a resistance that’s far outside the expected spec, which would suggest a fault. But a finite, reasonable resistance value confirms continuity.

Keep in mind this test only confirms the winding isn’t open and doesn’t guarantee starting performance by itself; the start circuit (capacitor/relay) and overall compressor condition also affect starting. Always ensure the device is isolated and capacitors discharged before testing.