Which of the following is an appropriate action to take if an AED indicates a malfunction?

When an AED indicates a malfunction, it is essential to take appropriate action to ensure the safety and effectiveness of the device during a critical situation. Taking the AED out of service and contacting the manufacturer is the correct course of action. This ensures that any potential issues are addressed promptly and prevents the risk of using a malfunctioning device that could compromise patient care.

The AED is a vital piece of equipment in a cardiac emergency, and its reliability must be maintained to ensure it functions correctly when needed. Therefore, continuing to use the AED without concern could lead to serious consequences if the device fails to operate properly during a resuscitation attempt. Additionally, simply changing the battery may not resolve the underlying problem causing the malfunction; the device may require professional evaluation and servicing. Ignoring the warning and proceeding with CPR without addressing the AED's issues puts the patient at unnecessary risk.