When a residential hardwired smoke detector continues to emit an intermittent chirping sound even though its indicator light remains steadily green, it indicates that the unit is actively receiving primary 120-volt AC power from your home's electrical grid, but the backup battery is failing or missing. The green LED confirms AC power, while the chirp is a dedicated low-voltage warning triggered when alkaline backup cells drop below acceptable thresholds. You can troubleshoot smoke alarm warnings safely by accessing the unit on the ceiling. You can verify that your corrective action is successful when opening the battery compartment, replacing the depleted battery with a fresh alkaline cell, and reattaching the unit stops the chirping completely while keeping the green power light active.
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