How to Test Your Smoke Alarm

  1. 1

    Press and hold the test button

    Every smoke alarm has a test button — usually in the centre or side of the unit. Press and hold it for 5–10 seconds. A working alarm emits a series of loud beeps. Release the button and the alarm stops. If the alarm chirps weakly or does not sound, replace the battery immediately.

  2. 2

    Test monthly — set a calendar reminder

    Monthly testing is the Australian Fire and Rescue Services recommendation. Set a recurring monthly calendar reminder. Testing takes 30 seconds and confirms the alarm, battery and horn are all functioning.

Maintaining Your Smoke Alarm

  • Replace batteries annually: Even if the battery is not low, replace it once a year. Many people replace batteries when clocks change for daylight saving (or the nearest Sunday to it in states that observe it). Use high-quality alkaline batteries or lithium batteries for longer life.
  • Clean the alarm annually: Dust and insects can block smoke sensors and cause false alarms or prevent detection. Use a vacuum with a brush attachment to gently clean the vents. Do not paint over alarms — paint blocks the sensor.
  • Replace the alarm every 10 years: Smoke alarms have a limited lifespan. Check the manufacture date on the back of the unit. After 10 years, replace the entire alarm even if it seems to work — the internal sensor degrades over time.
Australian requirementsAustralian Standard AS 3786 requires at least one smoke alarm in each bedroom, outside each sleeping area, and on every level of the home. In Queensland, new residential dwellings require interconnected photoelectric smoke alarms in all bedrooms, hallways and living areas. Requirements vary by state — check your state fire service website for specific requirements in your area.

Frequently Asked Questions

Ionisation alarms detect fast-flaming fires quickly (paper, thin wood) but are slower to detect slow smouldering fires. Photoelectric alarms detect slow smouldering fires (upholstered furniture, wiring) more quickly and have a much lower false alarm rate from cooking. Photoelectric alarms are now recommended by fire authorities in Australia and required in Queensland. If you have older ionisation alarms, consider replacing with photoelectric or dual-sensor alarms which detect both fire types.
Intermittent chirping (one beep every 30–60 seconds) almost always means a low battery. Replace the battery immediately — this is the alarm doing its job of warning you. Continuous rapid beeping is the alarm detecting smoke — check for a fire source. If the alarm beeps after a new battery is installed, the battery contacts may be dirty (clean with a cotton bud) or the battery may not be seated correctly. If beeping continues with a new battery and no smoke, the alarm may be at end of life — replace it.