Which issue indicates that a faulted TS relay needs replacement?

The need to replace a faulted TS relay is indicated by burned and pitted contacts. This serves as a clear sign that the relay has experienced excessive electrical arcing during operation, leading to degradation of its contacts. When contacts become burned and pitted, they may fail to close or open properly, which can compromise the relay's ability to function correctly within the system.

In a properly functioning relay, contact surfaces should remain smooth and intact to ensure reliable operation. When degradation occurs, not only does it affect the current flow, but it can also lead to additional faults in the circuit due to the relay's inability to effectively switch states as required under normal operating conditions. Therefore, observing burned and pitted contacts is a definitive signal that the TS relay is no longer reliable and should be replaced to maintain system integrity and performance.