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Photoelectric smoke alarms are essential for keeping you and your home safe. Their purpose is to sound when they detect smoke, and they can quite literally be the difference between life and death, especially if you and your family are asleep.

However, sometimes they go off for seemingly no reason, causing inconvenience and confusion. In this article, we will explore the most common reasons behind false alarms in smoke detectors and provide practical solutions to address them.

Understanding Smoke Alarms

Smoke alarms are essential safety devices that detect smoke and provide early warnings during a fire. They consist of a detection chamber that serves as the alarm’s heart. This chamber is equipped with sensors that detect smoke particles.

When smoke enters the detection chamber, the particles interfere with the sensors, causing the alarm to sound and the occupants to be alerted of potential danger. This quick response is crucial for giving people enough time to evacuate the building or take the necessary fire-fighting measures.

Difference In Alarm Sounds

It is essential to distinguish between the alarming and chirping sounds emitted by smoke alarms. The alarming sound is a loud, continuous beep that indicates the presence of smoke or fire.

On the other hand, the chirping sound is a periodic, intermittent beep that typically signifies a low battery or a malfunction in the alarm. False alarms, which we focus on in this article, refer to the alarming sound triggered by factors other than smoke or fire.

Causes of False Alarms

If your smoke alarm is going off for no reason, the following are some of its most common causes. You can take steps to remedy some of these issues yourself, but certain fixes may require the help of an experienced professional. In some cases, it can also be quicker to consult a professional to identify the cause of recurring triggers.


Dust accumulation is one of the most common causes of false alarms in smoke detectors. Dust particles can settle on the sensors inside the alarm over time, obstructing their proper operation. This can result in inaccurate readings and unnecessary false alarms.

It is essential to clean the smoke alarm regularly by gently tapping it to dislodge any trapped dust particles. One of the best ways is by using a vacuum cleaner to remove dust from the alarm itself and its surroundings carefully.

During home renovations or construction activities, cover or remove the alarm to protect it from construction debris. Gyprock, a common building material, can generate dust and cause false alarms, particularly in new installations or after renovations.

You should also ensure the alarm is not positioned directly in front of air conditioning vents or intakes, as the increased airflow can carry dust particles through the device.


Insects can be another culprit behind false alarms in smoke detectors. While smoke alarms typically have insect mesh surrounding the detection chamber, small insects can still manage to enter and trigger false alarms. They may find their way into the detection chamber of the alarm and interfere with the sensors, resulting in incorrect readings.

To prevent this, a surface spray around the alarm (while the alarm is removed) is recommended to deter insects from approaching it. In addition, consulting with an electrician to seal any openings in the ceiling through which insects may enter from the roof cavity can help reduce false alarms caused by insects. Purchasing smoke alarms specifically made to deter insects can also help.

Moisture And Humidity

High humidity and moisture levels can also contribute to false alarms in smoke detectors. Excessive humidity can cause condensation to form on the sensors, resulting in incorrect readings. As such, we recommend not installing smoke alarms in areas with high humidity, such as bathrooms, laundries, or kitchens, where moisture is consistently present.

Proper ventilation is essential for lowering humidity levels, so use exhaust fans and open windows to encourage air circulation in these areas. Air conditioning units, dehumidifiers, and desiccants can all help to regulate humidity levels and reduce false alarms caused by moisture.

Electrical Faults And Interference

While relatively rare, electrical faults and interference can also result in false alarms. Issues such as power surges or faulty wiring can disrupt the functioning of smoke alarms and trigger false readings.

If false alarms persist and are solely associated with the power connection, consulting with an electrician to assess and resolve any underlying electrical problems is recommended. In addition, if you use wireless smoke alarms, installing an electromagnetic interference (EMI) filter can help eliminate interference from other electrical devices, ensuring the reliable operation of the smoke alarm.

For more information regarding false alarms, visit our FAQ page below: 

Frequently Asked Smoke Alarm Questions

Enhanced Safety with Lifesaver 6800 Series

If you have been struggling with false alarms, consider the Lifesaver 6800 series of smoke alarms from PSA Products – now with the new Advance Sensor chamber. The Advance Sensor is resistant to moisture-related triggers from high-humidity events, features an anti-static chamber that repels dust, and has minimal fine bug mesh.

Designed specifically for Australia’s environment, the Advance Sensor helps the Lifesaver alarms minimise false alarm triggers. The alarms have been tested and approved to Australian Standards, having yielded zero failures in an 18-month test over 40 false alarm-prone sites in Australia.

Click below to learn more about the Advance Sensor and the Lifesaver 6800 Series:

Discover the Lifesaver 6800 Series

Source Your Smoke Alarms From PSA Products

PSA Products is your trusted source for high-quality smoke alarms and fire safety equipment. Our range of products is designed to meet stringent safety standards and provide reliable performance.

By sourcing your smoke alarms from PSA Products, you can have peace of mind knowing that you have invested in top-notch devices less prone to false alarms. Contact us today to learn more.