After identifying a suspect relay, what is a prudent next step in testing the control circuit?

• A. Replace the suspect relay, then re-test the circuit
• B. Replace all relays in the circuit
• C. Power up and observe without changes
• D. Ignore it and continue operation

Answer: (A)

When you’ve identified a relay as suspect in a control circuit, the practical move is to replace it and then re-test. Swapping the suspected relay with a known-good unit removes that component as the source of the problem, so if the circuit behaves correctly after replacement, you’ve confirmed the relay was the cause. Re-testing afterward verifies that the cure works and that no other hidden issue is masking the fault. It’s important to power down and follow safety procedures before changing a component. Replacing all relays or just powering up to observe won’t pinpoint the fault and can waste time or create more risk, and ignoring the issue leaves a potential hazard in the system.