FAQs

If your alarm is frequently chirping it could be for a number of reasons.
1. Incorrectly attached to baseplate If correctly attached to the baseplate, your alarm should show a green LED, with a red LED flash every 30‑45 seconds. If this is not the case, your alarm is not fitted correctly. We recommend detaching the alarm from the baseplate and reattaching to stop the beeping. If this does not help, try the following step.
2. Incorrect wireless connection. If your alarms are wirelessly connected, try ‘unlearning’ the alarms and refit. If the alarm is still chirping, remove the faulty alarm/s and seek a replacement, or contact FireAngel’s Customer Support team if your alarms are still in warranty.

Read our blog for more support information – Why is my FireAngel Pro Connected smoke alarm beeping?

A non-responsive alarm could be because it is out of date or the battery needs replacing or because it has not been connected correctly. Make sure that the alarm has been installed correctly and that the pin has been removed from sealed battery alarms. To test your alarm press the circular button on the front of the alarm. If the alarm is still not responding, please contact our Customer Support team.

To confirm your warranty, you need your proof of purchase including the date purchased and the batch number which can be found printed on the alarm. The warranty begins from the date purchased.

Depending on the model and type of alarm, there will be a ‘replace by’ date printed on the side which will tell you when the alarm will need replacing. If you had your alarms installed by the Fire and Rescue Service, they will have written the install date down.

To test your alarm, simply press the circular button on the front of the alarm once. The alarm should beep and the LED should flash while testing. Do not try and test the alarm with burning materials or open flames around the device as this can be dangerous and is not the best way to test the sensor.

Smoke and heat alarms should be replaced every 10 years because their sensors degrade over time. After a decade, the sensitivity of the alarm may be compromised, reducing its ability to detect smoke or heat effectively. You should always check the alarm for the ‘replace by’ date if your are unsure.

The LED lights let you know if the alarm is working properly. A solid light means that the device is operating as normal, a flashing light means the alarm has been activated or is completing a test.

A smoke alarm detects smoke particles using an optical or ionisation sensor, while a heat alarm detects temperature changes using a thermistor. Smoke alarms are designed for bedrooms, hallways and living rooms. Heat alarms are designed for kitchens, garages and utility rooms where smoke alarms would trigger false alarms from cooking or fumes. Most homes need both types for full coverage. See our guide on what fire alarms to install and where.

Interconnected alarms are linked together so that if one alarm detects smoke or heat, all alarms in the system will sound. This increases safety by providing earlier warnings, especially in larger homes. Our Pro Connected range and models that can include an RF module are interconnected wirelessly.

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.

The internal power pack of the alarm will not activate until the unit has been correctly installed onto its base plate. Once the alarm is secured on the base plate, press the large central button to test.

Ensure alarms are installed in appropriate locations. Smoke alarms should be kept away from kitchens and bathrooms where cooking fumes and steam can trigger false alarms.
Clean alarms regularly to remove dust or debris that could cause false alarms.
Consider installing heat alarms in areas prone to false alarms, such as kitchens and garages.

To maintain your smoke/heat alarm clean the outer casing and air vents using a vacuum cleaner with a soft brush attachment. Avoid using water or chemicals.
Test the alarm monthly by pressing the test button on the front of the alarm.
Replace the battery (if applicable) when the low-battery warning chirps.

Mains-powered alarms: These are hardwired into your Home’s electrical system, often with a backup battery. They usually have a visible wire connection or a green LED indicating connection to the mains.
Battery-powered alarms: Operate solely on batteries and will not have a mains connection. These are typically easier to install and perfect for travel.

Alarms are supplied with the correct baseplate required for installation. If your alarm has been supplied without this, please return to the place of purchase for a replacement.

When fixing your alarm to the baseplate, it’s important to turn it as far as possible to ensure it is engaged and secure. If the ‘lugs’ at the rear of the alarm can be seen, then the alarm will be secure and can be installed. However, if you’re unable to turn the baseplate enough for these to be seen then we can offer an alternative baseplate.

Smoke alarms should be installed in hallways, landing areas, lounge areas where people gather, inside or directly outside of bedrooms and on each level of your home to ensure comprehensive coverage. Check out our house map to see where is best to put smoke alarms, and check the local regulations applicable to your home using our helpful guides.

See the installation instructions in the product box or product page for installation instructions.

See the installation instructions in the product box or product page for installation instructions.

Carbon monoxide is a poisonous gas, produced when fuel doesn’t burn correctly, that cannot be seen, smelt, or tasted. The only way to detect it is with a CO alarm. Your CO alarm should be installed 1-3 meters away from any fuel-burning appliance, they can be freestanding on a shelf or wall mounted.

See the installation instructions in the product box or product page for installation instructions.

Mains-powered alarms: Yes, these require professional installation by a qualified electrician to ensure they are wired safely to your home’s electrical system.
Battery-powered alarms: These can typically be installed by homeowners following the instructions in the product box.

Replaceable battery models: Yes, the battery can be replaced when the low-battery warning sounds.
Sealed battery models: No, these models come with a non-replaceable, long life battery designed to last for the lifetime of the alarm (typically 10 years). The whole device needs to be replaced after the battery runs out.

Unlike smoke alarms, heat alarms have been specifically designed for areas with fumes and high humidity e.g. kitchens where cooking fumes are present and attics or garages where there is lots of dust and usually high humidity. Nearly 50% of fires start in kitchens in domestic properties – installing a heat alarm in this room will mean you’re rapidly alerted to danger and reduce the number of nuisance alarms.

Find out the difference between smoke alarms and heat alarms.

The RF modules purpose is to interlink your units with each other wirelessly. If the module is removed, the alarm cannot send a signal to any other unit within the network, so the interlink feature will not work.

It’s not recommended to mix alarms from different manufacturers as they may not be compatible in terms of interconnectivity or performance. FireAngel alarms should ideally be used with other FireAngel models to ensure proper functioning of any linked alarm systems.

If you have any further questions, get in touch with our Customer Support team who would be happy to help.

A heat alarm is the best alarm for a garage, loft or utility room where fumes may set off false alarms in smoke alarms.

As your alarms are all wirelessly interlinked, we will need to make sure we identify the faulty unit(s) within your network correctly. To do so we kindly ask you watch the following video that shows you How to unlink your alarms.

Up to 20 devices can be interlinked wirelessly and up to 35 devices can be interlinked if they are hardwired. If you are unsure, please contact our expert customer service team.

As your alarms are all wirelessly interlinked, when one alarm activates it will trigger all other interconnected alarms to sound as well. This is to ensure that wherever you are located in the property you are still able to hear the alarm. If these alarms continue to sound you will need to ensure there is no signs of fire and press the test button briefly to mute each alarm.

To safeguard elderly parents, read the FireAngel elderly solutions guide. Local Fire and Rescue Services can also perform free ‘Safe and Well’ checks for vulnerable occupiers. For maximum protection, consider the FireAngel Pro Connected range.

By using Pro Connected alarms, you can be alerted via the FireAngel Pro Connected App so you will always know when an alarm is activated and which alarm it is.

FireAngel alarms are primarily designed and developed in the UK, with manufacturing and assembly taking place in both the UK and abroad, depending on the specific product line.

FireAngel alarms are certified to meet British Standards and European Standards for safety including BS EN 14604, BS 5446-2, EN 50291, BSI Kitemark.

Want to collaborate? Get in touch with us.

The vibrating pad that forms part of the W2‑SVP‑630L Wi‑Safe 2 Strobe and Vibrating Pad (FS1552W2-T) contains a small motor which in turn contains a small magnet. General advice for products incorporating magnets, and for electrical products in general is for users fitted with a pacemaker or users of other medical equipment should check with authorised medical staff and the instructions of the device manufacturer before use, we recommend that these steps are taken by users of Wi‑Safe 2 system. During the development and certification of the W2‑SVP‑630L, the product passed the required set of Electromagnetic Compatibility (EMC) tests. These tests determine whether electromagnetic emissions from a product will interfere with the performance of other devices, or whether the performance of the product could be affected by emissions from other devices. In addition to the EMC tests, additional tests were carried out to measure the magnetic fields produced by the motor contained within the vibrating pad. This report can be provided on request. This work was completed in January 2011 a précis of which is that findings were that a maximum magnetic field strength at any point on the outer casing of the vibrating pad was 46uT (46 micro Tesla’s). As a meaningful measurement to give some indication of How weak this is, the earth’s magnetic field varies between 25uT and 65uT. In cases of doubt, this information should be viewed by the patient’s consulting cardiologist for a final decision.

We are able to provide the FireAngel Connected app on the current version of both iOS and Android. FireAngel Connected on the App Store (apple.com) and FireAngel Connected – Apps on Google Play.

Thermoptek is a type of smoke alarm sensor technology and is used in FireAngel’s Pro Connected range of mains and battery powered Multi‑Sensor smoke alarms, which is the trusted technology of the UK Fire and Rescue Service since 2007. Thermoptek technology provides a much faster response to fire, giving you more time to escape should a fire occur.

FireAngel Thermistek technology is found our Pro Connected heat alarms and combines a patented radiant heat dish, high‑performance Class A1 thermistor and a predictive monitor algorithm in order to provide a quicker response to danger. When compared to traditional heat alarms, Thermistek technology reduces the reaction window by half – meaning you and your family have vital extra time to react.

You would need to contact your local Fire and Rescue Service to discuss eligibility criteria for a Safe and Well check.

Ionisation smoke alarms are more responsive to smoke with smaller particles such as those found in fast flaming fires whereas optical alarms are more responsive to the dense smoke found in slow smouldering fires. Following official guidance, at FireAngel we no longer manufacture ionisation alarms.

Waste electrical products should not be disposed of with your other Household waste. The alarm is ideally suited for disposal within the waste electronic and electrical equipment (WEEE) recycling scheme. Please recycle where facilities exist. Check with your local authority, retailer or contact our technical support team for recycling/ disposal advice as regional variations apply. Once the alarm is removed from the base plate the internal battery will be deactivated and the alarm will stop emitting the low power warning chirp. The unit is now ready for disposal. WARNING: Do not attempt to open. WARNING: Do not burn.

While both are radio frequency technologies, Wi‑Safe2 is a dedicated mesh network technology that has been built by FireAngel specifically to support your safety‑critical smoke, heat and Carbon Monoxide alarms. Your FireAngel devices will not interact with your WiFi network.

Sealed for Life Battery Units: These alarms come with a non-replaceable, sealed battery designed to last the lifetime of the alarm (typically 10 years). They require no battery changes and provide constant protection without maintenance.
Replaceable Battery Units: These alarms allow you to replace the battery when it runs low. You’ll need to change the battery every 1-2 years, depending on the type of battery used.

For people who are deaf or hard of hearing, there are specialised fire safety devices that include the Vibrating pad and Strobe alarm which provides a physical and visual alert when the alarm is activated.

From October 2022, the law changed surrounding carbon monoxide alarms in rented properties – for both the private and social sectors. As a private or social landlord, you will need to ensure you have a working carbon monoxide alarm 1‑3 metres away from any fuel burning appliances in a property (excluding gas cookers) and that any faults or repairs are carried out on the alarm in a timely manner.

In the UK, landlords must install at least one smoke alarm on every storey of a rental property where there is a room used as living accommodation. In addition, a carbon monoxide alarm must be fitted in any room with a solid fuel-burning appliance.

For maximum protection for private rental properties smoke alarms must be installed on every floor where there is living accommodation (e.g., bedrooms, living rooms, hallways)
Heat alarms should be installed in kitchens and areas prone to false alarms.
Carbon monoxide alarms must be fitted in rooms with solid fuel appliances (e.g., wood-burning stoves, coal fires). Consider installing interconnected alarms to increase safety, especially in larger properties or properties with multiple tenants.

For smoke alarms install at least one on every floor of your home, inside bedrooms and in hallways. For CO alarms install one in rooms near fuel-burning appliances. Find out which alarms are best for your property by using our help to buy quiz.

The following alarms are suitable for use on boats:
FA6615 Optical Smoke Alarm
FA6620 Optical Smoke Alarm
SB1 Optical Smoke Alarm
FA6720 Kitchen Heat Alarm
FA3313 Carbon Monoxide Alarm
FA3820 Carbon Monoxide Alarm
FA3322 Digital Carbon Monoxide Alarm
For more information, read: All aboard for Boat Safety Week 2024 | FireAngel

FireAngel smoke and heat alarms that are suitable for use in a leisure vehicle, including caravans, motorhomes or campervans, include:
FA6615 Optical Smoke Alarm
FA6611 Smoke Alarm with Escape Light
FA6620 Optical Smoke Alarm
SB1 Optical Smoke Alarm
FA6720 Kitchen Heat Alarm
FireAngel CO alarms suitable for use in a leisure vehicle, including caravans, or campervans, include: FA3313 Carbon Monoxide Alarm
FA3322 Digital Carbon Monoxide Alarm
FA3820 Carbon Monoxide Alarm
For more information, read: Heat & Smoke Alarms for Caravans, Motorhomes & Campervans

Sync-It (NFC) enables certain FireAngel alarms, like the FA3328, to communicate with Android phones for easy data transfer. This technology simplifies monitoring and testing for professionals.

Thermoptek combines optical sensing with thermal enhancement, enabling faster detection of both slow-smoldering and fast-flaming fires. This dual-sensor approach enhances response time to a variety of fire types.

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Install a CO alarm in every room with a fuel-burning appliance such as a boiler, gas fire, or wood-burning stove. Position it on the ceiling or high on a wall, between 1m and 3m from the CO source. For full coverage, fit one in every bedroom and living area too. See our guide on how many carbon monoxide alarms you need for room-by-room advice.

FireAngel Smart RF technology allows alarms to communicate wirelessly. When one alarm detects a hazard, all interconnected alarms will sound simultaneously, ensuring full-home coverage.

For maximum protection (LD1), smoke alarms should be installed in escape routes, all circulation areas, living rooms, bedrooms, airing cupboards, meter cupboards, lofts, and garages.

Refer to the product-specific manual for proper testing instructions. Regular testing helps ensure your alarms are working correctly and provides peace of mind.

• New or materially altered dwellings, up to three storeys with no floor exceeding 200 m2.
• Existing dwellings with poor or inadequate fire protection, up to three storeys with no floor exceeding 200 m2.
• Individual dwelling units of two or more rooms in Houses in Multiple Occupation (HMOs) of one or two-storeys, with no floor exceeding 200 m2.

Carbon Monoxide is produced when fuels burn incompletely – this could be from a boiler, gas fire, oven, log burner or a blocked flue or chimney. It can also travel through walls from adjoining properties, so as well as having an alarm next to appliances in your property we would also advise you to have one in living spaces and bedrooms. To help prevent a Carbon Monoxide leak we advise getting your appliances regularly serviced by reputable engineers who are gas safety registered.

Make sure the alarm is correctly located on the base plate and ensure the mains power supply is on. If there is still no connection, inspect the circuit breaker or fuse in the power circuit to the alarm. Failing this, call a qualified electrician to inspect the house wiring and connection.

A Heat Alarm is perfect for detecting fires like those caused by faulty white goods, as they usually create a ‘blast’ of fire that’s very hot. Heat Alarms won’t false alarm to a dusty or humid room which makes it perfect for kitchens, utility rooms and garages where these items are usually found.

If the battery stops working, you will need to replace them if they are removable or else you may need to replace the entire device. Please check with customer support if you feel there is a fault with the battery.

Our quiet test function means that you can test your alarm is working without having the full volume of the alert. Press and hold the circular button for quiet testing.

If you have a static caravan, CO alarms should be mounted to the wall rather than free standing. Most of our sealed battery smoke and heat alarms are compliant for motorhomes but contact customer support if you’re unsure.

The warranty period is usually between 3-5 years but check your alarm packaging and manual for up to date information. Remember: keep hold of your receipt to make sure your warranty is valid.

Test at least once a week by pressing the test button. Vacuum around the alarm every six months to remove dust. Your alarm will alert you with a low-battery chirp when the battery is running low. See our full smoke alarm testing guide for more detail.

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.

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.

Press the large central test button on the FA6615-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 FA6615-R, the Sleep Easy feature lets you silence low-battery chirps for up to 8 hours while you arrange replacement batteries. Simply swap the two AA batteries for new ones to restore full protection. A continuous loud alarm means smoke has been detected – evacuate immediately and call 999.

Nuisance alarms are often caused by cooking fumes, steam, or dust near the sensor. The FA6615-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 FA6615-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 batteries may need replacing.

Replace your end-of-life ST-625 or ST-622 with the FA6615-R. It offers optical sensing, replaceable AA batteries, Sleep Easy, and a quiet test function. The FA6615-R fits the same baseplate as the ST-625 with a simple swap, or can be installed using the supplied base and screws. It also replaces the ST-620 and ST-750 using the existing baseplate. See our complete installation guide for step-by-step instructions.

Press the test/hush button on the FA3820-EUX10. You will hear two loud sequences of four beeps and the LED will flash, confirming the alarm is working. Test at least once a month and vacuum around the unit every six months to remove dust. See our full guide to testing your CO alarm for more detail.

If the alarm sounds, open all windows and doors immediately to ventilate the room. Turn off any fuel-burning appliances if it is safe to do so. Move everyone, including pets, outside into fresh air and call the Gas Emergency Service on 0800 111 999. Do not re-enter the property until a qualified engineer has confirmed it is safe. See our step-by-step guide to what to do if your CO alarm goes off.

Early symptoms include headaches, dizziness, nausea, breathlessness, and tiredness. These are often mistaken for flu because carbon monoxide is colourless and odourless. Prolonged exposure can lead to confusion, loss of consciousness, and can be fatal. If several people in the same building feel unwell at the same time, suspect carbon monoxide and evacuate immediately. Visit our carbon monoxide safety page for more information.

A continuous loud alarm with four beeps means carbon monoxide has been detected – evacuate immediately and call 0800 111 999. A single chirp at regular intervals usually means the battery or sensor is reaching end of life and the unit needs replacing. The 30-day memory function on the FA3820-EUX10 lets you check whether CO was detected while you were away. See our guide to CO alarm beeping for a full explanation of each sound pattern.

If your home has any fuel-burning appliance – including a gas boiler, gas cooker, gas fire, oil burner, or wood-burning stove – you should have a carbon monoxide alarm. In England, a CO alarm is legally required in any room with a fixed combustion appliance (excluding gas cookers) under the Smoke and Carbon Monoxide Alarm (England) Regulations 2015 (amended 2022). Scotland and Wales have similar requirements.

Replace your end-of-life CO-9X with the FA3820-EUX10. It offers an advanced electrochemical sensor, a 10-year sealed battery, a ventilate pre-alarm warning, and BSI Kitemark certification. The FA3820-EUX10 fits in the same location as your old alarm. For a model with a digital display showing the CO reading in parts per million, consider the FireAngel FA3322. See our complete installation guide for step-by-step instructions.

The FP2620W2-R works as a standalone or wirelessly interlinked alarm without the Gateway. However, adding the Pro Connected Gateway enables real-time smartphone notifications through the FireAngel Pro Connected App, so you receive alerts even when you are away from home.

The FP2620W2-R uses Thermoptek multi-sensor technology that combines optical and thermal sensing. This toast-proof design distinguishes between cooking fumes and real fire, so it can be placed near kitchens and dining areas without nuisance alarms. If it does trigger accidentally, press the central button to hush for up to 10 minutes.

A single beep every 40 seconds typically means the battery is reaching end of life and the alarm needs replacing. A repeated pattern of beeps indicates a fault. The Sleep Easy mode can silence low-battery beeps overnight. See our smoke alarm beeping guide to identify the specific pattern and what to do.

In Scotland, interlinked smoke alarms have been a legal requirement in all homes since February 2022. In England, smoke alarms are required on every storey of rental properties under the Smoke and Carbon Monoxide Alarm Regulations 2015. The FP2620W2-R meets these requirements wirelessly with no cabling needed. See our guide to interconnected smoke alarms for full details.

Standard optical alarms use a single light-scatter sensor to detect smoke particles. Thermoptek adds a thermal sensor that monitors heat changes, allowing the alarm to respond to both slow-smouldering and fast-flaming fires and reducing false alarms from steam or cooking fumes. See our guide on what smoke alarm should I buy for a full comparison.

As a minimum, install one smoke alarm on every storey of your home, including hallways and landings. For better coverage, add alarms in every bedroom, living room and dining room. The FP2620W2-R can interlink wirelessly with up to 50 devices, making whole-home coverage simple. See our guide on the best smoke alarms on the UK market for recommendations.

Press and hold the test button on the FA6812-EUX10. The alarm will sound, the red LED will flash, and the LCD display will show a test reading, confirming the unit is working. Test at least once a month. See our full guide to testing your CO alarm for more detail.

If the alarm sounds, open all windows and doors immediately. Turn off any fuel-burning appliances if safe to do so. Move everyone, including pets, outside into fresh air and call the Gas Emergency Service on 0800 111 999. The LCD display will show the CO level in ppm so you can report the reading to the engineer. See our step-by-step guide to what to do if your CO alarm goes off.

Yes. The FA6812-EUX10 is EN 50291-2:2019 certified specifically for use in caravans, campervans, motorhomes and leisure accommodation vehicles. At just 146g it is lightweight and portable, and can be placed free-standing on any flat surface. See our guide to caravan fire and CO safety for full advice.

The LCD screen shows the current carbon monoxide concentration in parts per million (ppm). Under normal conditions it displays zero. If CO is detected, the number rises to show the exact level. The alarm triggers at thresholds set by EN 50291: 50ppm within 60 to 90 minutes, 100ppm within 10 to 40 minutes, and 300ppm or more within 3 minutes.

A single chirp every 40 seconds with an amber LED flash means the battery is low and needs replacing. A repeated alarm pattern with a red LED means CO has been detected. An EOL (end-of-life) alert means the 10-year sensor has expired and the unit needs replacing. Sleep Easy mode can silence low-battery chirps for 8 hours overnight. See our CO alarm beeping guide to identify the specific pattern.

If the FA6812-EUX10 detects carbon monoxide while you are away, the memory function stores the event. When you return, the red LED will flash twice every 40 seconds for up to 7 days to alert you that CO was present. Press the test button to clear the memory indicator. See our guide to CO alarm memory for more information.

The FA6812-EUX10 uses 2 x AA alkaline batteries, which are included. Battery life exceeds 3 years under normal conditions. When the battery runs low, a chirp sounds every 40 seconds and the amber LED flashes. Replace with any standard AA alkaline battery from brands such as Duracell, Energizer, or similar.

Press the test button once for a quiet self-test at reduced volume, or press twice for a full-volume 85dB test. The LCD display will show a test reading and the LED will flash, confirming the unit is working. Test at least once a month. See our full guide to testing your CO alarm for more detail.

Yes. The FireAngel FA3322 was awarded Which? Best Buy status for carbon monoxide alarms. Which? independently tests products for detection speed, alarm volume, battery life, and ease of use. Read more about the FA3322 Which? Best Buy award.

A single chirp typically means low battery, though the FA3322 has a sealed 10-year battery so this usually indicates the unit is reaching end of life and needs replacing. A repeated alarm pattern with red LED means CO has been detected. Sleep Easy mode can silence low-battery chirps for 8 hours overnight. See our CO alarm beeping guide to identify the specific pattern.

If the FA3322 detects carbon monoxide while you are away, the 30-day memory stores the event. A red LED flashes twice every 40 seconds for up to 7 days to alert you that CO was present. The LCD display also shows the peak CO level recorded during the event. Press the test button to clear the memory indicator. See our guide to CO alarm memory for more information.

Yes. The FA3322 is the replacement for any end-of-life CO-9D alarm. It offers the same digital display functionality with significant upgrades including a 10-year sealed battery, pre-alarm low-level CO detection, temperature and humidity monitoring, and BSI Kitemark certification to the latest EN 50291 standards.

When the FA6611-R detects smoke, the built-in escape light activates automatically alongside the 85dB alarm. The extra-bright light illuminates your escape route so you can navigate safely even in complete darkness. This is especially useful for escape routes, including hallways, landings and bedrooms where a fire could leave you disoriented at night.

Press the test/hush button once for a quiet self-test at reduced volume, at least 10dB below the full alarm. Double-press for a full-volume 85dB test. Both the alarm sound and the escape light will activate during the test. Test at least once a month. See our full guide to testing your smoke alarm for more detail.

A single chirp every 40 seconds typically means the AA batteries need replacing. Unlike sealed-battery alarms, you can simply swap in new batteries. If the chirping continues after replacing batteries, the 10-year sensor may have reached end of life and the alarm needs replacing entirely. See our smoke alarm beeping guide to identify the specific pattern.

False alarms are usually caused by steam, cooking fumes, dust, or insects entering the sensor chamber. The FA6611-R has a hush function that silences nuisance alarms for a few minutes. If false alarms happen often, try vacuuming around the sensor and repositioning the alarm away from kitchens and bathrooms. See our guide on top 10 reasons your smoke alarm goes off randomly.

The FA6611-R uses 2 x AA alkaline batteries, which are included. Battery life is up to 3 years under normal conditions. When the battery runs low, a chirp sounds every 40 seconds. Replace with any standard AA alkaline battery. Sleep Easy mode can silence low-battery chirps for 8 hours overnight.

Yes. The FA6611-R is ideal for bedrooms because the escape light provides immediate illumination if smoke is detected while you are asleep. The quiet self-test means you can check the alarm monthly without a full-volume alarm disturbing the household. See our guide on what smoke alarm should I buy for room-by-room advice.

Yes. The FA6611-R is suitable for leisure vehicles including caravans, campervans and motorhomes. The escape light is especially valuable in a confined space where visibility during a fire is limited. See our guide to caravan fire and CO safety for full advice on protecting your leisure vehicle.

Yes. The FA6611-R is the direct replacement for the end-of-life ST-623E smoke alarm. It offers the same escape light functionality with upgrades including a 10-year sensor life, quiet self-test, Sleep Easy mode, and a slimmer 32mm profile. If your ST-623E is beeping continuously, it has reached end of life and should be replaced with the FA6611-R.

A heat alarm detects rapid rises in temperature rather than smoke particles. The FA6720-R uses a thermistor sensor that triggers when ambient temperature reaches between 54 and 65 degrees Celsius. This makes heat alarms ideal for kitchens, garages and utility rooms where cooking fumes, steam or dust would cause a smoke alarm to false alarm.

A single chirp from the FA6720-R typically means the sealed battery is reaching end of life. Because the battery is sealed and tamperproof, it cannot be replaced. Use the Sleep Easy function to silence low-battery chirps for 8 hours overnight. When the alarm reaches end of life after 10 years, replace the entire unit. See our guide to maintaining and testing your heat alarm for more detail.

Heat alarms trigger at temperatures between 54 and 65 degrees Celsius. If your heat alarm triggers frequently, check that it is not positioned directly above a hob, oven or toaster where concentrated heat rises. Reposition the alarm further from the heat source while keeping it on the ceiling. If the alarm continues to trigger without an obvious heat source, it may be faulty and should be replaced.

Yes. The FA6720-R is designed for any room where smoke alarms are unsuitable. This includes garages, unconverted loft spaces, utility rooms and boiler rooms where dust, fumes or humidity would trigger false alarms from a smoke detector. The alarm operates in temperatures from 4 to 38 degrees Celsius, so it is suitable for unheated spaces that do not freeze.

Press the test/hush button once for a quiet self-test at reduced volume, at least 10dB below the full alarm. Double-press for a full-volume 85dB test. Test at least once a month. See our full guide to maintaining and testing your heat alarm for more detail.

Yes. The FA6720-R is the direct replacement for the discontinued HT-630 heat alarm. It uses the same baseplate, so you can swap units without drilling new holes. The FA6720-R offers upgrades including a 10-year sealed lithium battery, thermistor sensor technology, quiet self-test and Sleep Easy mode. If your HT-630 is chirping continuously, it has reached end of life and should be replaced with the FA6720-R.

No. The FA6629S is battery powered and designed for simple DIY installation. The base plate is secured with screws, and the alarm clicks into place with a clockwise twist. No wiring or electrician required.

Replace your end-of-life ST-622 or ST-620 with the FA6629S. It offers an advanced optical sensor, sealed 10-year battery, Night Mode, and Sleep Easy – all in an ultra-slim design that fits the same ceiling position.

Yes. A single press of the Test/Hush button performs a test at reduced volume. A longer press performs a full-volume test at 85dB.

When smoke is detected, the FA6629S emits a loud, continuous 85dB alarm and displays a clear visual warning. The alarm continues until the air clears. Test regularly using the Test/Hush button to familiarise yourself with the sound.