A hot compressor with an infinite ohm reading between Common and the other two terminals and a reading of 43 ohms between the start and run terminals most likely has?

In the scenario described, the hot compressor demonstrates an infinite ohm reading between the Common terminal and the other two terminals, which indicates that there is a break in the circuit—that is, there is no continuity between these points. This condition is characteristic of an open circuit. Additionally, the 43 ohm reading between the start and run terminals suggests there may be some level of resistance within the compressor, potentially caused by an internal overload.

In compressor maintenance, an open internal overload situation typically occurs when the internal protection mechanism has tripped, preventing the compressor from starting due to overheating. This would present itself as an infinite resistance between the terminal points, confirming the open condition.

The other options do not align with the readings noted. A short circuit would generally provide low resistance readings, a malfunctioning capacitor would typically present symptoms elsewhere and wouldn't lead to infinite resistance, and excessive refrigerant pressure might result in increased operational pressures but would not directly correlate with the resistance readings provided. Therefore, the indication of an open internal overload is the most logical conclusion in this context.