York S1-025-29041-005 Limit Switch The Trane SWT1277 Limit Switch

The Trane SWT1277 Limit Switch is a critical safety component designed for precise thermal regulation in Trane and American Standard HVAC furnaces

preventing cavitation and maintaining flow rate consistency

blue flame for reliable ignition and reduced carbon monoxide production

Enhanced Safety: The SPNO (Close on Fall) logic acts as a primary fail-safe against inducer motor failure or obstructed flue pipes

Unlike generic seals

York S1-025-29041-005 Limit Switch The Trane SWT1277 Limit SwitchFor contractors servicing York and Coleman heating equipment, the York S1 025 29041 005 Limit Switch is a critical OEM replacement part designed for high limit temperature monitoring. This auto reset limit control is engineered with a 3 inch insert (3" stem) and features a specific thermal profile where the contacts open at 140F and automatically close at 110F. If you are troubleshooting a furnace short cycling or encountering a 4 red light flash code