Error Short beep once a minute: The smoke alarm gives a brief beep every minute.

Possible cause: The battery is worn out and needs replacing - the low-voltage warning will keep sounding for about seven days.. Replace the battery immediately.

Error LED doesn't blink once a minute: The smoke alarm's LED doesn't blink once a minute as it normally would.

Possible cause: The battery is completely flat.. Replace the battery immediately.

Error One chirp a minute: The carbon monoxide detector gives one audible chirp every minute, and can continue doing so for up to 30 days.

Possible cause: Settings of the sensor and circuitry are incorrect or the batteries have become low.. Check/replace batteries or unit if required.

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Auto-Trail • V-Line SE • Smoke & CO Alarms

Auto-Trail Smoke & CO Alarms

(V-Line SE, 2026 Model Year)

View official manual on manufacturer's site ↗

Master Troubleshooting & Diagnostics Matrix

Error Code / Indicator	Symptom / Meaning	Possible Cause	Step-by-Step DIY Fix	Suggested Actions
`Short beep once a minute`	The smoke alarm gives a brief beep every minute.	The battery is worn out and needs replacing - the low-voltage warning will keep sounding for about seven days.	Replace the battery immediately.	DIY Safe
Recommended partsAffiliate linksView 2 optionsHide Check which battery your smoke alarm takes (look at the battery fitted now), then choose the matching one: The handbook says the smoke alarm is battery-operated but doesn't name the battery type, so check yours before ordering. 9V batteryDuracell Plus 9V Alkaline Batteries (2 Pack) 6LR61~£6.50 for 24.7★ (15,000+ ratings), dispatched/sold by Amazon View on Amazon → 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 →
`LED doesn't blink once a minute`	The smoke alarm's LED doesn't blink once a minute as it normally would.	The battery is completely flat.	Replace the battery immediately.	DIY Safe
Recommended partsAffiliate linksView 2 optionsHide Check which battery your smoke alarm takes (look at the battery fitted now), then choose the matching one: The handbook says the smoke alarm is battery-operated but doesn't name the battery type, so check yours before ordering. 9V batteryDuracell Plus 9V Alkaline Batteries (2 Pack) 6LR61~£6.50 for 24.7★ (15,000+ ratings), dispatched/sold by Amazon View on Amazon → 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 →
`One chirp a minute`	The carbon monoxide detector gives one audible chirp every minute, and can continue doing so for up to 30 days.	Settings of the sensor and circuitry are incorrect or the batteries have become low.	Check/replace batteries or unit if required.	DIY Safe
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 alarm model or its 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 →