What should be checked when a compressor does not lock out under oil failure conditions?

When addressing the failure of a compressor to lock out under oil failure conditions, it is crucial to check the differential switch wiring. The differential switch is designed to monitor oil pressure and ensure that the compressor operates only when adequate oil pressure is present. If the wiring associated with this switch is compromised, it may not accurately signal the compressor to shut down during low oil pressure events. This lack of a proper signal can lead to compressor operation even in conditions where oil failure could cause severe damage.

Additionally, the differential switch's integrity is vital for the safety and longevity of the compressor. If there are breaks or poor connections in the wiring, the system might not receive the necessary feedback, leading to undesired operation under critical conditions. Ensuring the differential switch wiring is intact and functioning properly is essential to protect the compressor from running without the required lubrication, which could result in catastrophic failure.