If a hardwired residential smoke detector continues to emit chirps or alarm beeps even after you have removed its backup battery, it indicates that the unit is still actively receiving continuous 120-volt AC power directly from your home's electrical distribution grid. Hardwired smoke alarms are interconnected through wall cables and receive primary operating power from a dedicated circuit breaker. Removing the battery cuts backup power but leaves the AC line active. Furthermore, capacitor discharge can cause brief lingering beeps. You can troubleshoot alarm noise safely by shutting off the designated branch circuit breaker at your main service panel. You can verify that your corrective action is successful when turning off the breaker and twisting the smoke alarm off its ceiling bracket completely silences the unit, allowing safe maintenance or replacement.
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