CPSC recall 12-701, announced October 20, 2011, covers Sensor System CO 1224T Carbon Monoxide (CO) detectors (about 20,000 units). When the CO detectors reach the end of their useful life, they should send a signal to make a sound in the home alarm panel alerting consumers it is time to replace them and a signal to ADT's alarm monitoring center. The notice reports no incidents. Consumers should contact ADT immediately for a free inspection of the recalled detectors and, if necessary, a free repair. Recall contact: call (800) 238-2727, or go to www.us.adt.com.
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Compare the model on your label, then check any serial numbers, date codes, and exclusions in the notice. A model match alone does not confirm that your unit is included.
Affected model numbers
The model number is behind the front cover.
Which products are included?
This recall involves hard-wired carbon monoxide detectors with model CO 1224T installed by ADT. The model number is behind the front cover.
Confirm these details on the official CPSC noticeWhat to look for
- Model numbers
- One listed. Yours must match it exactly.
- When sold
- October 2008 through December 2010
Why it was recalled
When the CO detectors reach the end of their useful life, they should send a signal to make a sound in the home alarm panel alerting consumers it is time to replace them and a signal to ADT's alarm monitoring center. Some of the detectors were not wired properly to the ADT alarm system, resulting in the sound not going off in the home alarm panel and no signal to the ADT alarm monitoring center at the end of its useful life. Not replacing a CO detector at the end its useful life poses a CO poisoning hazard to consumers.
Incidents and injuries
None reported.
Official remedy
Consumers should contact ADT immediately for a free inspection of the recalled detectors and, if necessary, a free repair. Consumers should not attempt to disable the recalled detectors. ADT has contacted all customers.
What to do now
- Check the label. Compare your model number with the one listed in this recall.
- Contact the firm. Call (800) 238-2727, or go to www.us.adt.com.
- Get the remedy. This recall offers a repair. The notice says the remedy is free.
- Read the official notice. The CPSC notice is the final word on which units are included and what to do.
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Product and sales details
- Brand
- Sensor System
- Manufacturer
- Sensor System, of St. Charles, Ill.
- Product type
- Carbon monoxide alarms
- Recall number
- 12-701
- Units
- About 20,000
- Manufactured in
- China, Mexico
- Sold at / sales period
- Installed by ADT between October 2008 and December 2010 as part of home security systems.
- Distributor
- ADT Security Services Inc. of Boca Raton, Fla.
CO 1224T Carbon Monoxide (CO) detectors
CPSC product type: Carbon Monoxide Detectors/Alarms
This recall in context
Compared with the 19 carbon monoxide alarm recalls in this index, as of October 31, 2026.
- Size
- 20,000 units: the 11th-largest of 14 carbon monoxide alarm recalls that state a unit count. The median is 62,000 units.
- Hazards
- Carbon monoxide: named in 11 of 19 carbon monoxide alarm recalls, the most common hazard among them. Poisoning: named in 4 of 19 carbon monoxide alarm recalls.
- Remedy
- Repair: offered in 2 of 19 carbon monoxide alarm recalls. The most common is replacement (6).
- Time on sale
- About 2 years. Recalled 10 months after the last month of sales the notice gives.
Recall contact information
For additional information, contact ADT toll-free at (800) 238-2727 between 8 a.m. and 10 p.m. ET Monday through Friday or visit the company's website at www.us.adt.com
Verify phone numbers, hours, and websites on the current CPSC notice before contacting the firm.
Know someone who has one?
Recalls only work when owners hear about them. Send this notice to family or friends who might own the same product.
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