Whether a green indicator light should remain illuminated on a smoke detector depends entirely on the specific manufacturer, model design, and whether the unit is battery-operated or hardwired into your home's 120-volt electrical system. On many hardwired AC-powered smoke detectors, a solid or flashing green LED light serves as a normal operational status indicator confirming that the unit is actively receiving continuous electrical power from your home's AC distribution grid. Conversely, purely battery-operated smoke detectors rarely maintain a constant green light to conserve battery life, instead utilizing a subtle flashing red LED to indicate active monitoring. You can troubleshoot detector status easily by reviewing the manufacturer user manual. You can verify that your corrective action is successful when confirming that hardwired units show steady power and battery units respond to test buttons ensures proper operation.
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