Reported risk: These "Snap Action" thermal switches were sold under the model number 2450A, 2455RA, or 2455RM. They have model numbers and date codes stamped on the sensing surface or end cap. Following are those model numbers and date codes that are part of the corrective action: Model Number Date Codes Part of Corrective Action 2455RA and 2450A Z0412, Z0413, Z0414, Z0415, Z0416, Z0417, Z0418, Z0419, Z0420, Z0421, Z0427, Z0429, Z0430, Z0431,Z0432, Z0434, Z0435, Z0436, Z0437 2455RM Z0421, Z0427, Z0429, Z0430, Z0431, Z0432, Z0434, Z0435, Z0436, Z0437 Hazards: When these switches are used in fire or HVAC dampers and heat detectors, they could fail to operate, causing the damper not to close or causing the heat detector not to alarm, if there is a fire.
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