Lochinvar & A.O. Smith 100148403 Limit Switch 319852-301 While the charcoal filter element

While the charcoal filter element may trap some residual fine particles

Thermal Management: Features internal thermal protection to safeguard the windings against overheating during peak summer loads

ensuring reliable fail-safe operation during power loss

Direct Fit Compatibility: Specifically sized for 1" 25AUB-1 and LF25AUB-Z3 models

Manual Override Security: Requires a physical reset by a technician

Lochinvar & A.O. Smith 100148403 Limit Switch 319852-301 While the charcoal filter elementThe Lochinvar & A. O. Smith 100148403 Limit Switch is a critical OEM replacement part designed for high limit temperature protection in commercial water heaters, boilers, and pool heaters. This 175 degree high limit assembly monitors the heat exchanger or outlet water temperature, providing an essential safety cutoff to prevent thermal runaway and equipment damage. Engineered for HVAC systems requiring precise thermal regulation, the 100148403 ensures