If hardwired interconnected photoelectric smoke alarms are activating without any identifiable cause, it could be due to issues with the power supply or incorrect installation. In some cases, fluctuations in the power supply in regional or remote areas or from electrical/electronic equipment in the home can cause false activations. Installing a filter on the switchboard can reduce the impact of these fluctuations. Incorrect installation can also cause false activations, and smoke alarms should not be connected to lighting circuits with dimmers.
Homeowners should discuss the installation of hardwired smoke alarms with a licensed electrician to ensure they are properly installed and to reduce the instance of false activations.