Smoke alarm indicator light does not flash every minute

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

The smoke alarm gives a brief beep every minute.

Possible cause: The battery is worn out and due for replacement, which triggers this low-voltage warning.. 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: Incorrect sensor/circuitry settings or low batteries. Fit new batteries in the detector - this chirp doesn't mean carbon monoxide has actually been detected.

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Auto-Trail • F-Line • Smoke & CO Alarms

Auto-Trail Smoke & CO Alarms

(F-Line, 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`	Smoke alarm indicator light 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 smoke alarm gives a brief beep every minute.	The battery is worn out and due for replacement, which triggers this low-voltage warning.	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.	Incorrect sensor/circuitry settings or low batteries	Fit new batteries in the detector - this chirp doesn't mean carbon monoxide has actually been detected.	DIY Safe
Recommended partsAffiliate linksView 2 optionsHide Check which battery type your CO alarm takes (look at the batteries fitted now), then choose the matching pack: The handbook doesn't say which battery this alarm uses. Most caravan CO alarms take AA or 9V batteries, so check yours before ordering. 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 →