What does an "OL" reading on a technician's meter indicate when checking the compressor start winding?

An "OL" reading on a technician's meter, which stands for "over limit," indicates that the resistance is infinite, suggesting that the winding is open. This means that there is a break in the electrical circuit, preventing current from flowing through the compressor's start winding.

This reading is critical for diagnosing issues with the compressor. When the winding is open, it can lead to the compressor not starting at all, as no electrical current can energize the winding. Thus, detecting an "OL" signifies that the start winding needs to be inspected or replaced to restore the functionality of the compressor.

Understanding this helps technicians troubleshoot electrical problems in compressors effectively, as it directly points to an essential component that may be failing. In contrast, readings that indicate normal resistance, short circuits, or grounding issues would show different outcomes on the meter, emphasizing the unique significance of an "OL" reading in identifying an open winding.