Question 1

No alarm sounds when the test button is held down

Accepted Answer

Possible cause: Defective batteries or another failure. Replace the batteries; if it still doesn't sound, the unit needs to be returned for service.

Question 2

Erratic or low sound from the smoke alarm

Accepted Answer

Possible cause: A defective alarm. Return the alarm for service.

Question 3

Smoke alarm chirps every 30-40 seconds for at least seven days

Accepted Answer

Possible cause: The battery is running low. Replace the 9V battery with one of the specified types - using a different type can affect the alarm's operation.

Question 4

Smoke alarm still won't return to normal operation after cleaning

Accepted Answer

Possible cause: The unit itself has failed. Replace the smoke alarm.

Question 5

CO alarm chirps every 60 seconds with the red LED flashing

Accepted Answer

Possible cause: Low batteries. Replace the batteries as soon as possible.

Question 6

The CO alarm gives two chirps every half-minute alongside a double flash of its red LED

Accepted Answer

Possible cause: The alarm has reached the end of its life. Replace the alarm.

Question 7

CO alarm chirps every 30 seconds with the red LED flashing every 30 seconds

Accepted Answer

Possible cause: A fault with the alarm. Replace the alarm.

Question 8

CO alarm's red LED is on with a constant tone

Accepted Answer

Possible cause: A malfunction with the alarm. Replace the alarm.

Question 9

CO alarm sounds a loud, continuous tone with the red LED lit

Accepted Answer

Possible cause: Dangerous levels of carbon monoxide have been detected. Follow the emergency procedures described in the handbook (evacuate, ventilate, and don't return until the alarm clears).

Elddis Smoke & CO Alarms

Master Troubleshooting & Diagnostics Matrix

Error Code / Indicator	Symptom / Meaning	Possible Cause	Step-by-Step DIY Fix	Suggested Actions
`N/A`	No alarm sounds when the test button is held down	Defective batteries or another failure	Replace the batteries; if it still doesn't sound, the unit needs to be returned for service.	DIY Check / Tech Fallback
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 →
`N/A`	Erratic or low sound from the smoke alarm	A defective alarm	Return the alarm for service.	Professional Intervention Required
`N/A`	Smoke alarm chirps every 30-40 seconds for at least seven days	The battery is running low	Replace the 9V battery with one of the specified types - using a different type can affect the alarm's operation.	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 →
`N/A`	Smoke alarm still won't return to normal operation after cleaning	The unit itself has failed	Replace the smoke alarm.	DIY Safe
`N/A`	CO alarm chirps every 60 seconds with the red LED flashing	Low batteries	Replace the batteries as soon as possible.	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 →
`N/A`	The CO alarm gives two chirps every half-minute alongside a double flash of its red LED	The alarm has reached the end of its life	Replace the alarm.	DIY Safe
`N/A`	CO alarm chirps every 30 seconds with the red LED flashing every 30 seconds	A fault with the alarm	Replace the alarm.	DIY Safe
`N/A`	CO alarm's red LED is on with a constant tone	A malfunction with the alarm	Replace the alarm.	DIY Safe
`N/A`	CO alarm sounds a loud, continuous tone with the red LED lit	Dangerous levels of carbon monoxide have been detected	Follow the emergency procedures described in the handbook (evacuate, ventilate, and don't return until the alarm clears).	DIY Safe