The smoke alarm gives a brief beep every minute.

Possible cause: The battery is worn out and needs replacing.. Replace the battery immediately.

LED indicator on smoke alarm does not flash every minute

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

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

Possible cause: Settings of sensor/circuitry found to be incorrect or batteries have become low. Replace the batteries (and ensure unit is within its 10-year lifetime).

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

Auto-Trail Smoke & CO Alarms

(V-Line Sport, 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
`N/A`	The smoke alarm gives a brief beep every minute.	The battery is worn out and needs replacing.	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 →
`N/A`	LED indicator on smoke alarm does not flash every minute	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 →
`N/A`	The carbon monoxide detector gives one audible chirp every minute, and can continue doing so for up to 30 days.	Settings of sensor/circuitry found to be incorrect or batteries have become low	Replace the batteries (and ensure unit is within its 10-year lifetime).	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 →