What should you check if a compressor starts but quickly trips on overload?

When a compressor starts but quickly trips on overload, it typically indicates an issue that is causing the unit to draw excessive current, leading to overheating. Checking the contractor for pitting is particularly relevant because pitting signifies that the contacts are worn or damaged, which can prevent proper electrical flow or cause intermittent connections. This irregularity can cause the compressor motor to experience voltage fluctuations or even a voltage drop, resulting in the compressor overheating and tripping on overload.

Additionally, a faulty contractor may not adequately provide power to the compressor when it's needed, contributing to erratic behavior and excessive load conditions. Therefore, assessing the contractor for pitting helps ensure reliable electrical performance, which is essential for the smooth operation of the compressor.

While verifying the power supply for fluctuations, the compressor oil level, and the discharge line for blockages are also important maintenance checks, they may not directly address the immediate cause of a compressor tripping on overload when starting. These factors can lead to compressor issues over time but are less likely to be the direct cause of the fault being described in this scenario.