CO/Smoke Detectors (System Sensor) – carbon monoxide risk (2015)
Check Your Product
According to the U.S. Consumer Product Safety Commission (CPSC)
Product
i4 Series System Sensor combination carbon monoxide (CO)/smoke detectors
Brand
System Sensor, of St. Charles, Ill.
Lot Codes / Batch Numbers
Not specified in CPSC notice. Check official source for details.
Product Images
Source: U.S. Consumer Product Safety Commission
System Sensor, of St. Charles, Ill. is recalling i4 Series System Sensor combination carbon monoxide (CO)/smoke detectors. The hazard is: The detectors can fail to detect carbon monoxide gas in the home, posing a risk of carbon monoxide p. Based on CPSC recall notice.
Summary derived from CPSC notice
The following details were not provided by CPSC: UPC codes.
Reason for Recall
As stated by CPSC
This recall involves System Sensor i4 series combination carbon monoxide/smoke detector models COSMO-2W and COSMO-4W manufactured between 9/3/14 and 9/13/14. The detectors are round, white, and measure about 5.5 inches in diameter. Recalled units have date codes 4091 or 4092 printed on the lower left-hand corner of the label affixed to the back of the product and on the packaging.
Reported concern (CPSC)
The detectors can fail to detect carbon monoxide gas in the home, posing a risk of carbon monoxide poisoning.
Recommended Action
Per CPSC guidance
Consumers should immediately contact System Sensor to obtain a free replacement combination CO/smoke detector. Consumers should keep using the recalled detectors until replacement detectors are installed.
Verify this information on the official source
For complete details and official instructions, check the U.S. Consumer Product Safety Commission (CPSC) directly.
View official CPSC recall noticePage updated: Jan 6, 2026