White FA3313x4 carbon monoxide alarm with test button and indicator lights, angled view.
Side view of FA3313x4, a white plastic device with vent slits and wall-mount bracket.
Technical drawing of FA3313x4, 119x62x38mm, small oval device with circular and oval details.
FA3313x4 White FireAngel alarm mounted on a wall with bracket and screws.
Which? Best Buy August 2025 badge for CO alarm on green background.
Exploded view of FA3313x4 smoke alarm showing batteries, components, and battery life information.
Exploded view of FA3313x4 smoke alarm with BSI Kitemark certification badge.
Close-up of the FA3313x4 carbon monoxide alarm, featuring fast CO detection.
Close-up of FA3313x4 carbon monoxide alarm with red LED showing previous activation.
FA3313x4: Carbon monoxide alarm with yellow warning light and sleep easy function.
Close-up of a FireAngel FA3313x4 carbon monoxide alarm with highlighted silence feature.
A person relaxing in bed with an FA3313x4 clock and air monitor on the bedside table.
Modern kitchen with herbs in pots and FA3313x4 on a wooden worktop.
FA3313x4 device, box, and batteries on a wooden table next to a small potted plant.
Modern living room with a fireplace, standard lamp, and FA3313x4 on a wooden coffee table.
FA3313x4 alarm: pull disable tab, wait 1 minute, press test button to activate alarm.
FA3313x4 installation guide: shelf and wall mounting steps with labelled diagrams.

FA3313-EUX10

Carbon Monoxide Alarm, Replaceable Batteries

CO 5 Year Warranty Battery included Battery Silence

Product description

Looking for a CO-9B alarm replacement? With the latest sensing technology, a clear loud alarm and BSI Kitemark approval, the FA3313X4 offers the highest level of CO detection for your home and replaces end-of-life CO-9B alarms.

Intelligent CO sensing technology enables the alarm’s high sensitivity mode to be activated if it predicts CO levels will increase to or above 180ppm for a quicker alert.

 

  • Advanced electrochemical sensor detects dangerous levels of carbon monoxide (CO) in your home and alerts you with a clear, loud alarm
  • The alarm has been designed to either be wall mounted or left portable so you can take it on holiday for protection on the go, it’s also suitable for caravans, motor caravans and boats
  • As well as being calibrated and rigorously tested in-house the alarm has been third party approved through the British Standards Institute (BSI) and is kitemark certified
  • The device is supplied with 2 x AA batteries, which can be replaced as required when the alarm provides the low battery warning sound
  • Pressing the large test button in the event of a low battery warning will activate our sleep easy feature which silences the low battery chirp for 8 hours
  • Suitable for homes in England and Wales, including rented properties, not suitable for Scottish homes under the new regulations
  • The FA3313 detector holds a CE and UKCA mark and has been designed to conform to the standards – BS EN 50291-1: 2008 and EN 50291-2: 2019

 

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Price range: £23.00 through £42.00

PRODUCT SUPPORT

Looking for a CO-9B alarm replacement? With the latest sensing technology, a clear loud alarm and BSI Kitemark approval, the FA3313X4 offers the highest level of CO detection for your home and replaces end-of-life CO-9B alarms.

Intelligent CO sensing technology enables the alarm’s high sensitivity mode to be activated if it predicts CO levels will increase to or above 180ppm for a quicker alert.

 

Installation & setup

Get the help and support you need to easily set up and install your FireAngel alarm for instant protection.

Installation guide

Installation guide

Click the icon to find out more about installing your pro connected app

Maintenance guide

Maintenance guide

Click the icon to find out how to maintain and test your alarm

Resources

To ensure you install the right alarm for your home, and one that's compliant with your local fire regulations, review our manual and data sheet or get in touch with our customer service team.

Product manual

Product manual

Click the icon to download the product manual

Datasheet

Datasheet

Click the icon to download the product datasheet

Related FAQs

Yes – this Carbon Monoxide Alarm is EN 50291-2 certified and IP44 splash resistant, suitable for all domestic settings, including caravan holiday homes, caravans, motor caravans, and boats.

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.

Yes – Our FP1820W2-R, FA3820X4 and FA3322X4 products have sealed for life batteries and will protect your home, without you need to replace the batteries every year.

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.

When a Carbon Monoxide alarm is triggered, it will emit an alarm sound consisting of 4 loud beeps and a break repeated until the sensor is clear of Carbon Monoxide gas.

Yes – the FireAngel Pro Connected FP1820W2-R Carbon Monoxide Alarm, when paired with a Smart Gateway, will allow you to review alerts and easily test the alarm from your phone.

See all faqs

Take your CO on the GO

Make sure you’re always protected from carbon monoxide with our Which? recommended FA3322 Digital CO Alarm.

 

which-fa3322

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Reviews from our customers

Five stars review

“I thoroughly believe in this product, and wouldn't change it at all! It is very competitively priced, and a solid piece of kit!”

Amazon Customer, Originally posted on amazon.com

Five stars review

“Easy to install and neat in appearance. Alarm is loud enough for me to hear.”

Amazon Customer, Originally posted on amazon.com

Five stars review

“Great so far. Seems to work but you have no idea if they do work until you want them too! Good solid product though and perfect for a rental property to comply to requirements”

Amazon Customer, Originally posted on amazon.com

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Got a burning question? Get in touch

If you can't find what your looking for on our blogs and looking for further guidance and advice, our UK-based Customer Support team are on hand all week from 8:30am until 5:30pm, they can answer any further queries you may have on our products, solutions or services.