you need a 3-pole contactor that can stand up to high-amperage demands without premature pitting or coil failure

This control is a direct OEM replacement part (replaces 571-100-006 in some configurations) and typically features a manual reset and LED status indicators for diagnostic clarity in the field

Common Questions Is the S1-025-41239-000 compatible with older York air handlers

R43107-001

as it provides a higher ceiling for electrical stress

Lochinvar & A.O. Smith 100148403 Limit Switch 328140-751 you need a 3-pole contactorThe 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