Which statement describes a PDI indicator on smoke detectors?

Which statement describes a PDI indicator on smoke detectors?

• A. Green power light illuminated
• B. Red light illuminated
• C. No light displayed
• D. Blue light appears when smoke is detected

Answer: (A)

The PDI indicator is about the power and health status of the smoke detector. When the green power light is illuminated, it shows the unit is receiving power and functioning normally, so the detector is able to monitor for smoke and respond if needed. This is exactly what you want to see during a PDI check—the detector is online and ready. Seeing a red light would indicate a fault or alarm condition that needs maintenance, not normal operation. No light means power or the indicator itself isn’t functioning, so you can’t rely on that detector. A blue light that appears when smoke is detected isn’t the standard PDI signal; the PDI focus is the power/status indicator, which is green when everything is OK.

The PDI indicator is about the power and health status of the smoke detector. When the green power light is illuminated, it shows the unit is receiving power and functioning normally, so the detector is able to monitor for smoke and respond if needed. This is exactly what you want to see during a PDI check—the detector is online and ready.

Seeing a red light would indicate a fault or alarm condition that needs maintenance, not normal operation. No light means power or the indicator itself isn’t functioning, so you can’t rely on that detector. A blue light that appears when smoke is detected isn’t the standard PDI signal; the PDI focus is the power/status indicator, which is green when everything is OK.