Question 1

Smoke alarm chirps once every 40 seconds

Accepted Answer

Possible cause: Low power pack condition. Replace the alarm straight away - it'll continue to warn for at least a week, but its power may run out before then, leaving it unable to alert you in an actual fire.

Question 2

Pressing the smoke alarm's test button produces no sound

Accepted Answer

Possible cause: A fault with the alarm. Refer to the troubleshooting guide at the end of the manual; the alarm likely needs replacing.

Question 3

The CO detector gives one chirp every minute, continuing for as long as 30 days

Accepted Answer

Possible cause: A fault with the sensor/circuitry settings, or low batteries (not a CO detection). Fit new batteries right away. If the chirping carries on even with fresh batteries, contact Technical Support while the unit is still under warranty for guidance, or simply replace the unit outright once warranty has expired.

Question 4

CO alarm sounds continuously with the Alarm LED flashing red once a second

Accepted Answer

Possible cause: Carbon monoxide has been detected - the response time is faster at higher concentrations. Open doors and windows to ventilate, turn off appliances, evacuate, and contact the authorities to locate the source before re-entering; seek medical attention for anyone affected.

Error Code / Indicator	Symptom / Meaning	Possible Cause	Step-by-Step DIY Fix	Suggested Actions
`N/A`	Smoke alarm chirps once every 40 seconds	Low power pack condition	Replace the alarm straight away - it'll continue to warn for at least a week, but its power may run out before then, leaving it unable to alert you in an actual fire.	DIY Safe
`N/A`	Pressing the smoke alarm's test button produces no sound	A fault with the alarm	Refer to the troubleshooting guide at the end of the manual; the alarm likely needs replacing.	DIY Safe
`N/A`	The CO detector gives one chirp every minute, continuing for as long as 30 days	A fault with the sensor/circuitry settings, or low batteries (not a CO detection)	Fit new batteries right away. If the chirping carries on even with fresh batteries, contact Technical Support while the unit is still under warranty for guidance, or simply replace the unit outright once warranty has expired.	DIY Check / Tech Fallback
Recommended partsAffiliate linksView 4 optionsHide Does the CO alarm itself need replacing? It may be a sealed unit with a built-in battery. FireAngel lists both of these alarms as suitable for caravans and motorhomes: The handbook doesn't name the battery type, so check your own alarm (and the expiry date on its back) before choosing. Sealed unit (10-year battery)FireAngel FA3322 Digital Carbon Monoxide Alarm~£37.994.6★ (700+ ratings), sold by FireAngel, dispatched by Amazon - battery sealed in for the alarm's life View on Amazon → Replaceable batteries (2x AA)FireAngel FA3313 Carbon Monoxide Alarm~£18.984.7★ (970+ ratings), dispatched/sold by Amazon - supplied with 2x AA batteries View on Amazon → Are the batteries replaceable in your CO alarm? Check which type it takes (look at the batteries fitted now), then choose the matching pack: AA batteriesDuracell Plus AA Alkaline Batteries (12 Pack) 1.5V, LR06~£9.00 for 124.7★ (71,000+ ratings), dispatched/sold by Amazon View on Amazon → 9V batteryDuracell Plus 9V Alkaline Batteries (2 Pack) 6LR61~£6.50 for 24.7★ (15,000+ ratings), dispatched/sold by Amazon View on Amazon →
`N/A`	CO alarm sounds continuously with the Alarm LED flashing red once a second	Carbon monoxide has been detected - the response time is faster at higher concentrations	Open doors and windows to ventilate, turn off appliances, evacuate, and contact the authorities to locate the source before re-entering; seek medical attention for anyone affected.	Professional Intervention Required

Elddis Smoke & CO Alarms

Master Troubleshooting & Diagnostics Matrix