If the run winding on a compressor shows a resistance of 0 ohms, what does this signify?

A resistance measurement of 0 ohms in the run winding of a compressor indicates a short circuit in the winding. This means that there is a direct connection within the winding material, which allows current to flow without any resistance, thus resulting in a measurement of zero ohms.

When windings are functioning properly, they typically have some resistance, which reflects normal operational characteristics. An open winding would show infinite resistance, indicating a break in the circuit, while grounding would imply that the winding is unintentionally connected to the ground, potentially leading to electrical faults or failures.

Therefore, the indication of zero ohms signifies that the winding is shorted, restricting the proper function of the compressor and potentially causing further damage if not addressed.