- HVAC
- Smoke and CO alarms
ALARMA-CO-3-PITIDOS-LARGOS
Ei Electronics three long beeps on CO alarm: CO danger
Risk level
Critical
Stop using the equipment and contact a professional.
Urgency
Immediate
Quick answer
Leave the home now with everyone, call 112 or your local emergency number if anyone feels unwell, and stay out until emergency services say it is safe. On an Ei alarm, three long beeps and a pause repeating with a red light warn of dangerous carbon monoxide.
Safety first
What to do now
- Get everyone out and call 112 if anyone has symptoms
Who: you and the other occupants, without stopping to search for the source. How: Ei says to turn off gas appliances, open windows and doors and leave; do so only with what is on your way out and only if it is safe, without turning back. Result that matters: getting everyone away from the carbon monoxide as fast as possible. If someone has a headache, nausea or dizziness: call 112 or your local emergency number and mention possible CO poisoning. If everyone is fine: ring your gas or fuel supplier's emergency number from outside. Evidence to keep: the time the alarm began and who was inside.
- Wait outside until you are cleared to go back in
Who: all occupants, in the street or at a neighbour's. How: Ei says not to enter until the alarm has stopped and to be absolutely sure it is safe before returning; leave that call to the emergency services. Result that matters: not going back while carbon monoxide is still inside. If the alarm keeps sounding: nobody goes in, not even for personal belongings. If the alarm has stopped: still wait for emergency services and leave gas appliances off. Evidence to keep: the name of the service that cleared entry and the time.
- Make sure you are not confusing it with a smoke alarm
Who: you, once you are outside and safe. How: Ei separates the sounds: a smoke or heat alarm gives a continuous beep, while a CO alarm repeats three beeps with a pause; either way the answer is to get out. Result that matters: telling the emergency services what kind of danger was signalled. If it was the three-beep pattern: report a carbon monoxide alarm to 112 and the engineer. If it was a continuous tone: treat it as a possible fire and call 112 from outside. Evidence to keep: a description of the sound or a recording made from outdoors.
- Pull the AudioLINK report once it is safe
Who: you or the engineer, only after entry has been allowed. How: if your alarm has AudioLINK+, Ei recommends extracting a report with its app once the alarm has stopped to see the details of the incident. Result that matters: giving the engineer event data that helps pinpoint the appliance responsible. If the report downloads: keep it and show it to the gas engineer. If your model has no AudioLINK: write down the times and what was running in the house. Evidence to keep: the AudioLINK report or notes of times and appliances in use.
What you must never do
- Do not attempt this professional task: Emergency services attendance
- Do not attempt this professional task: Inspection of gas and fuel appliances
- Do not attempt this professional task: Report review with Ei support
What a technician must be able to justify
Technician visit
These are the steps they must carry out and show you. Tick them as they work: if steps are skipped, do not accept a part swap.
These are not instructions for opening or handling the equipment yourself. They are the checks that should support a technical conclusion.
Emergency services attendance
What they do112 or your local emergency number helps anyone with symptoms and can send the fire service to measure CO and ventilate the home.
They must show youthe CO concentrations measured on each floor of the house.
In writingthe incident number and the time the home was declared safe.
Inspection of gas and fuel appliances
What they doA gas engineer finds the appliance that produced the CO and checks combustion and flue performance before it is used again.
They must show youthe CO reading in each appliance's flue gases and the chimney draught test.
In writingthe appliance responsible, the defect and whether it is capped off or safe to use.
Report review with Ei support
What they doEi Electronics technical support helps interpret the AudioLINK report and confirm whether the alarm is still in good order.
They must show youthe CO levels and times the alarm recorded.
In writingthe enquiry number and whether they advise keeping or replacing the alarm.
Before accepting a part or repair
Nothing has been shown yet. Do not accept a part swap based on the code alone.
Where this code applies
A code is meaningful only inside the right product and version context.
Primary scope
- System
- HVAC
- Brand
- Ei Electronics
- Product type
- Smoke and CO alarms
Known code variants
- detector de monóxido Ei pitando
- Ei carbon monoxide alarm going off
- Ei CO alarm three long beeps and pause
- Ei detector CO tres pitidos largos y pausa
- Ei Electronics alarma de CO tres pitidos
- Ei Electronics CO alarm three beeps
- Ei208 alarm sounding
- Ei208 suena
- Ei3018 alarma monóxido
- Ei3018 CO alarm
What it means
Get everyone out, call 112 or your local emergency number if anyone has symptoms, and wait outside until emergency services say you can return. According to Ei Electronics' FAQs, its CO alarms, such as the Ei208 or Ei3018, flash the red LED and give three long beeps with a pause, over and over, when they detect abnormal CO levels; multi-sensor alarms use the same pattern. Ei asks you to always assume it is a real emergency. The sound alone never proves that a part has failed, and other models may warn in a different way.
Warnings and stop conditions
- Criticalsource verified
Do not pull the alarm off its base or cover it to stop the noise: Ei warns that a CO alarm must never be ignored.
Evidence: Products FAQs
- Highsource verified
Do not relight boilers, stoves or gas cookers until a gas engineer has confirmed where the carbon monoxide came from.
Evidence: Products FAQs
Sources and technical references
- 1
Ei Electronics · 2026 · official_doc
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