York 3400-3151 Limit Switch For a full rebuild

For a full rebuild

maintaining the precise sequence of operation required for Amana and Goodman HVAC systems and protecting the heat exchanger from thermal stress

For technicians troubleshooting a furnace short cycling or ignition failure

utilizing genuine Spence replacement parts is essential to maintain the calibration accuracy of the D-Pilot

York 3400-3151 Limit Switch For a full rebuildThe York S1 3400 3151 Limit Switch is a critical safety component designed for high limit thermal protection in residential and commercial HVAC systems. This OEM replacement part is engineered to monitor furnace plenum temperatures, specifically calibrated with an open point of 175F and a close point of 125F. As an automatic reset limit switch, it eliminates the need for manual intervention once temperatures return to safe operating parameters.