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When an AED fails to analyze a rhythm, checking for correct pad placement is crucial. Proper pad placement is essential for accurate heart rhythm analysis. If the pads are not positioned correctly—either due to improper attachment or incorrect placement on the patient’s chest—the AED may not be able to detect the heart's electrical activity effectively. This action ensures that the device has the best chance of providing an accurate analysis.

Ensuring correct pad placement often resolves the issue and enables the AED to assess the heart's rhythm properly. Once the pads are correctly positioned, the AED can analyze the rhythm and determine whether a shock is advised.

Other options, while potentially related to handling issues with the AED, do not directly address the most immediate and correct action needed to troubleshoot the situation effectively.