March 07, 2013

Performance Related Concern with System Sensor Smoke Detectors

  • Type of Notification: Performance Related Concern
  • FM Approval Status: FM Approved

Alert Summary

FM Approvals has been made aware that an incorrect electronic transient protection component has been assembled into various smoke detectors. See attached Technical Field Bulletin issued by System Sensor on 02/01/2013.

Company (As Listed in the Approval Guide)

System Sensor Div of Honeywell
3825 Ohio Ave
Saint Charles, Illinois 60174

Contact Information


Product Identity

Smoke detectors, including combination smoke and heat.


2151, 2151T, 2W-B, 2WTA-B, 2WT-B, 2WTR-B, 4W-B, 4WITAR-B, 4WTA-B, 4WTAR-B, 4WT-B, 4-WTR-B, D2.

Date Codes AFfected

3014 and 3015.

FM Approval Status

All models were FM Approved throughout the date codes.

Hazard Involved

The above models during the affected date codes were manufactured with an incorrect transient protection component. This may increase the likelihood of damage to the detector should the detector be subjected to an electrical transient during operation. Electrical transients (over-voltages) in a circuit may exceed the electrical specifications of the product and can be caused by lightning strikes, power surges, power transitions, malfunctions caused by the power company, and electromagnetic pulses.

Further information on the System Sensor models can be found at

Using This Product?

If you suspect you are in possession of any of the affected equipment listed above bearing the FM Approvals certification marking, please bring that to the attention of:

Thomas McCarty

Norwood, MA, United States

+1 (1) 781-255-4802


Counterfeit Indicator

  • system

    Figure 1

Figure 1. Technical Field Bulletin