Smoke detector warning signal beeps

Possible cause: Block battery needs changing. Carefully twist the smoke detector's cover anti-clockwise until it comes free of its mount. Remove the old block battery and unclip it from the pins. Clip on a new 9V (type 6F22) block battery, making sure the pins click properly onto the poles, then fit the battery into its container. Line the cover's lock holes up with the locking pegs and turn it clockwise until it locks back into the mount.

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Hobby • Smoke & CO Alarms

Covers: Maxia T, Ontour A, Ontour C

+2 more

Ontour T, Prestige T

Ontour C models: C 680 GE, C 700 GQ, C 680 GE "F"

Ontour T models: T 710 GE, T 700 FH "L", T 700 FH, T 700 F

Ontour A models: A 720 GFM

Prestige T models: T 710 GE

Maxia T models: T 710 GE, T 740 WE, T 740 WF

Hobby Smoke & CO Alarms

(Motorhomes, 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 detector warning signal beeps	Block battery needs changing	Carefully twist the smoke detector's cover anti-clockwise until it comes free of its mount. Remove the old block battery and unclip it from the pins. Clip on a new 9V (type 6F22) block battery, making sure the pins click properly onto the poles, then fit the battery into its container. Line the cover's lock holes up with the locking pegs and turn it clockwise until it locks back into the mount.	DIY Safe
Recommended partAffiliate linksView partHide This handbook specifies a 9V battery for the smoke alarm. 9V batteryDuracell Plus 9V Alkaline Batteries (2 Pack) 6LR61~£6.50 for 24.7★ (15,000+ ratings), dispatched/sold by Amazon View on Amazon →

Frequently Asked Questions

Q: How do I test the smoke detector after changing the battery?

Hold the test button down for at least 4 seconds - the alarm sounding confirms the electronics are working, and it cuts out the moment you release the button.