What does continuity from any terminal to copper tube indicate when checking compressor windings?

Continuity from any terminal to the copper tube when checking compressor windings indicates that the compressor may be grounded. In a properly functioning compressor, there should be no electrical continuity between the windings and the compressor casing, which is typically made of copper. If continuity is detected, it suggests that a winding has shorted to the casing, which can lead to a situation where the compressor is not operating safely or effectively.

This scenario can lead to circuit damage or create safety hazards, as the electrical path to ground may cause the protective devices to trip or fail. Understanding this helps in diagnosing compressor issues, confirming whether it is presenting a grounded condition, and determining the necessary repair actions.