FA6620-R Optical Smoke Alarm – 10-Year Sealed Battery

No – this is a smoke alarm only and does not detect carbon monoxide. For CO protection, install a dedicated carbon monoxide alarm such as the FireAngel FA6829S alongside your smoke alarms. For combined protection in a single unit, consider the FireAngel SCB10-R combination smoke and CO alarm.

Press the large central test button on the FA6620-R. The quiet test function checks the alarm at a lower volume than a full alarm, so testing will not disturb loved ones or neighbours. Test at least once a week and vacuum around the alarm every six months to remove dust. See our full guide to testing your fire alarms for more detail.

A single chirp at regular intervals usually means the battery is running low. On the FA6620-R, the Sleep Easy feature lets you silence low-battery chirps for up to 8 hours so you can arrange a replacement without losing sleep. A continuous loud alarm means smoke has been detected – evacuate immediately and call 999. If the alarm sounds but there is no fire, press the test button to silence it temporarily and ventilate the room.

Install a smoke alarm on every level of your home. Position one in the hallway and landing on each floor, plus in bedrooms, living rooms, and dining rooms. Mount on the ceiling at least 300mm from any wall or light fitting. Do not fit a smoke alarm in the kitchen, bathroom, or garage – use a dedicated heat alarm such as the FireAngel FA6720-R for those areas instead. See our complete guide to installing smoke, heat and carbon monoxide alarms for step-by-step placement advice.

Nuisance alarms are often caused by cooking fumes, steam, or dust near the sensor. The FA6620-R uses optical sensing technology designed to reduce false alarms from cooking while still detecting slow-burning fires. If the alarm sounds without cause, press the test button to silence it temporarily. Make sure the alarm is not installed in a kitchen, bathroom, or other high-moisture area, and vacuum the unit regularly to prevent dust build-up.

On the FA6620-R, a red LED flash approximately every 40 seconds confirms the alarm is active and working normally. If the red light flashes more frequently or the alarm sounds, smoke has been detected – evacuate immediately and call 999. If the LED stops flashing entirely, the battery may have reached end of life and the unit should be replaced.

Replace your end-of-life ST-622T or ST-620 with the FA6620-R. It offers optical sensing, a 10-year sealed-for-life battery, Sleep Easy, and a quiet test function. The FA6620-R fits the same baseplate, or can be installed easily using the supplied base and two screws. See our complete installation guide for step-by-step instructions.

In England, at least one smoke alarm is required on every storey used as living accommodation under the Smoke and Carbon Monoxide Alarm (England) Regulations 2015 (amended 2022). Scotland and Wales have their own requirements. For whole-home coverage, the FireAngel Pro Connected range wirelessly interlinks all your alarms so if one sounds, they all sound.