Question 1

Error Red LED 1 flash every 2 seconds, buzzer with intermittent sound: Carbon monoxide concentration has exceeded the alarm threshold

Accepted Answer

Possible cause: CO has reached one of the alarm thresholds - 50ppm sustained for 60-90 minutes, 100ppm for 10-40 minutes, or 300ppm for as little as 3 minutes. Ventilate the room immediately. Where possible, turn off anything that could be producing carbon monoxide - gas fridges, cookers, combustion engines and similar - and don't use them again until a specialist engineer has checked them. Power the detector off and back on to reset it; if the alarm comes straight back on, evacuate the room. If anyone shows symptoms like headache, dizziness or nausea, get medical help immediately.

Question 2

Error Red LED turning on continuously: Detector malfunction

Accepted Answer

Possible cause: The detector's own electronics or sensor have developed a fault. Replace the device.

Error Code / Indicator	Symptom / Meaning	Possible Cause	Step-by-Step DIY Fix	Suggested Actions
`Red LED 1 flash every 2 seconds, buzzer with intermittent sound`	Carbon monoxide concentration has exceeded the alarm threshold	CO has reached one of the alarm thresholds - 50ppm sustained for 60-90 minutes, 100ppm for 10-40 minutes, or 300ppm for as little as 3 minutes	Ventilate the room immediately. Where possible, turn off anything that could be producing carbon monoxide - gas fridges, cookers, combustion engines and similar - and don't use them again until a specialist engineer has checked them. Power the detector off and back on to reset it; if the alarm comes straight back on, evacuate the room. If anyone shows symptoms like headache, dizziness or nausea, get medical help immediately.	Professional Intervention Required
`Red LED turning on continuously`	Detector malfunction	The detector's own electronics or sensor have developed a fault	Replace the device.	DIY Safe

CBE BMTCO

Master Troubleshooting & Diagnostics Matrix