CO Detectors and ‘False Alarms’

CO detector false alarmsCO detectors, or carbon monoxide alarms, are essential for the detection of a deadly gas, carbon monoxide (CO). This gas cannot be seen, tasted or smelt and is only detected with the use of co detectors. It is produced through the incomplete combustion of fuel, such as gas, wood, coal and oil.

Before we go on to look at CO detector false alarms here is some advice on what you should do if your alarm goes off.

What to do when your carbon monoxide alarm is going off

If your CO detector is chirping do not assume that it is a false alarm, remember carbon monoxide can’t be seen, tasted or smelt. You should assume that there is CO present and should follow these steps to ensure your safety.

  • Stay calm, open doors and windows to increase ventilation
  • Where safe to do so, turn off any fuel-burning appliance
  • Leave the premises and notify other occupants of the potential carbon monoxide leak (you should also notify any occupant of premises adjoined to your home as CO can seep through walls and floors
  • Call Gas Emergency Services 0800 111 999 or a local Gas Safe Registered Engineer to check for the source of carbon monoxide
  • Get medical help for anyone suffering from symptoms of CO poisoning

Symptoms of carbon monoxide poisoning

The main symptoms of carbon monoxide poisoning are:

Carbon monoxide poisoning symptoms: persistent headaches

Persistent Headaches

Having persistent dull headaches and tension type headaches.

Carbon monoxide poisoning symptoms: dizziness

Dizziness

Having waves of dizziness or feeling light headed and off balance.

Carbon monoxide poisoning symptoms: nausea/vomiting

Nausea / Vomiting

Feeling like you need to be sick (nausea) and actually being sick (vomiting).

Carbon monoxide poisoning symptoms: stomach pains

Stomach Pains

Pains in your stomach or lower abdomen, sometimes accompanied by diarrhoea.

Carbon monoxide poisoning symptoms: difficulty breathing

Difficulty Breathing

Sudden shortness of breath or difficulty breathing (dyspnoea).

Carbon monoxide poisoning symptoms: tiredness

Tiredness

Having no energy or feeling tired, sleepy, lethargic and sluggish.

Carbon monoxide poisoning symptoms: sudden collapse

Sudden Collapse

Sudden collapse, seizures or loss of consciousness.

Carbon monoxide poisoning symptoms: confusion

Confusion

Confusion, difficulty concentrating and becoming easily irritated.

What causes CO detector false alarms?

A false alarm is when your CO detector alarms and where no carbon monoxide is detected by your engineer. There could be several reasons for this:

  • The carbon monoxide detected did not come from your own appliances but may have seeped through the walls or floor from a neighbour. Check if your neighbours have fuel-burning appliances that might emit carbon monoxide Carbon monoxide might escape from chimney stacks allowing carbon monoxide to enter your premises via a joint loft space.
  • The replace-by date may have been exceeded. CO alarms become erratic once expired. This is the most common reason for false alarms.
  • Excessive moisture from a bathroom may set off your CO alarm. CO alarms should not be installed in areas with excessive steam.
  • Lead acid battery chargers produce hydrogen gas which sets off CO detectors. Keep this in mind if you are charging your caravan/boat battery at home.
  • Freshly screeded floors emit a gas that sets off carbon monoxide alarms.
  • The carbon monoxide alarm that you have installed may not be suitable for the type of premises, for example if it is installed in a caravan, tent, boat or living quarters of a horsebox you will need to ensure that your alarm is Kitemarked to BS EN50291-2. Alarms tested to BS EN50291-1 are only for use in home environments and are not suitable for camping and caravanning.
  • On rare occasions if here is a heavy smoker in a room that is poorly ventilated the CO from smoking may trigger an alarm.
  • Homes that are adjacent to very busy roads may experience higher levels of CO in the home when windows are open as traffic fumes may enter the room and set your alarm off.
  • The sound that your alarm is making may not be the alarm sound to alert you that there are dangerous levels of CO present. Most alarms have several audible sounds to indicate things such as low battery warning or that there is a fault with the alarm. When you install an alarm read the user manual and get to know what the different sounds indicate. Keep the manual safe so that you can refer to it should the alarm go off.

Buying a CO detector

You should have a carbon monoxide detector in every room where there is a solid fuel burning appliance. Only chose CO detectors that have met the rigorous testing standards of the European standard EN50291. That way you will have peace of mind that this vital alarm has been manufactured and tested to the highest standards.

If you are looking for a CO detector that you can also take on holiday, for caravanning, camping or using on a boat look out for ones that are Kitemarked to BS EN50291-2 such as the Kidde 7CO. If you would like a detector that gives you a visual display of CO levels, we recommend the Kidde 7DCO.

Kidde Carbon Monoxide Alarm - 7DCO / 7DCOC
Kidde Carbon Monoxide Alarm - 7DCO / 7DCOC
  • FREE delivery
  • Product Life: 10 years
  • Battery: replaceable AA alkaline batteries included
  • Warranty: 10 year warranty
  • Displays CO levels from 10ppm
  • Peak Level Memory - recalls highest CO levels
  • Ideal for domestic use and camping, caravans & boats
  • Kitemarked to BS EN50291-1 and BS EN50291-2
£14.09 ex VAT
£16.91 inc VAT
Buy Now
                                        

If you are unsure if you have the correct carbon monoxide alarm installed our customer care team are here to help. You can call them on 0800 612 6537 or email support@safelincs.co.uk.

Angie Dewick-Eisele

HR & Marketing Manager

Angie has been our marketing manager since joining in 2002. She also has a keen interest in H&S issues.

Smoke Alarm Beeping in the Night – A New Help Guide

Smoke alarm beeping in the night and keeping you awake? Whether you have a mains powered, interlinked smoke alarm or a battery powered smoke alarm, follow our guidance below to troubleshoot the beeping.

What sound is your smoke alarm making?

Smoke alarm sounding continuously

  • First check there is no smoke or fire in your property
  • Make sure the beeping is definitely coming from your smoke alarm. Other alarms in the property such as a carbon monoxide alarm or burglar alarm could be responsible for the noise.
  • Clean the alarm if it is dusty or dirty. Vacuum around the alarm or use a hairdryer to blow out dust on a cool setting.
Replace by date on the back of a smoke alarm | smoke alarm chirping in the night
Replace by date on back of smoke alarm
  • Check the replace by or manufacture date on your alarm. Smoke alarms usually last for a maximum of 10 years, so if the manufacturing date is approaching 10 years or more than 10 years, it’s time to get a new alarm. Sensors inside the alarm deteriorate after this time causing the alarm to be less effective.
  • Check the position of your alarm. There are different types of smoke alarm suitable for specific locations in your home. Find out more below about positioning your alarm.
  • Your smoke alarm may be damaged or have developed a fault. Exposure to water, fire, grease and certain types of paint can cause a fault to develop.

Smoke alarm chirping intermittently

  • Replace the battery* in your smoke alarm. Ensure you are using the correct battery type and are inserting it the correct way around. If the battery is low, it is more likely to sound at night as a drop in room temperature can impact the battery’s ability to power the alarm.
  • Check the manufacture date on your alarm. Smoke alarms usually last for a maximum of 10 years, so if the manufacturing date is approaching 10 years or more than 10 years, it’s time to get a new alarm. Sensors inside the alarm deteriorate after this time causing the alarm to be less effective.
  • Your smoke alarm may be damaged or have developed a fault. Exposure to water, fire, grease and certain types of paint can cause a fault to develop.

Wired smoke alarm beeping?

* All new or recently extended homes should have mains powered, interlinked alarms fitted which also have a back-up battery. Intermittent chirping in mains-powered alarms is often caused by low power in the back-up battery.

How to stop smoke alarm chirping

Suspect a fault?

If you suspect your smoke alarm has developed a fault, replace it as soon as possible. If you bought your alarm from Safelincs, you may be covered by warranty as all of our alarms have a minimum guarantee of 5 years. If you need a new smoke alarm, browse our range of battery smoke alarms or mains powered alarms.

Need replacement batteries?

Smoke alarms usually require either Alkaline AA batteries, an Alkaline 9V battery or a Lithium 9V battery. Buy replacement smoke alarm batteries as soon as possible.

Mains powered smoke alarm need replacing?

Mains powered smoke alarm beeping in the night

Whether your smoke alarm is mains powered or battery powered, it should be replaced after 10 years due to a deterioration of the sensors. Battery alarms are easily changed and installed, but how do you replace a mains powered alarm? Most mains powered alarms can be replaced without the need for an electrician if you purchase an Easichange® replacement head.

Related help guides:

Discontinued smoke alarm need replacing?

If you need to purchase a replacement alarm, but find that your existing model has been discontinued, you can check our replacement models guide to find the closest match.

Smoke alarm positioned correctly?

The type of sensor an alarm has determines where it should be positioned in the home. False alarms may be due to the wrong alarm type being used in or near a steamy, dusty or smoky environment.

  • Heat alarms are more suited to areas such as the kitchen or garage that are often smoky or dusty. Other types of sensors would be prone to false alarms in these areas.
  • Optical smoke alarms are ideal for bedrooms, living rooms and ground floor hallways.
  • Ionisation smoke alarms are ideal for use on landings, but will be prone to false alarms if located near a kitchen.

To avoid causing false alarms or affecting the performance of an alarm, it is good practice to avoid installing alarms in the following locations:

  • Next to a door, window, air vent or fan that would create a draft
  • Outside
  • Anywhere that airflow would be obstructed by curtains or furniture
  • Locations that are steamy or humid such as a shower room

Find out more about positioning your smoke alarm in your home or take a look at our help guides for more information about types of alarm sensor.

Always ensure you act as quickly as possible to change or replace a defective smoke alarm or you could be endangering lives. If you require any further assistance, contact our customer service team on 0800 612 6537 or email support@safelincs.co.uk.

Mel Saunders

Marketing Designer

Mel joined our team at the start of 2020. She creates our marketing materials and manages our social media accounts.