The Honeywell 50001774-001 is a high-grade 304 stainless steel immersion well engineered for precision temperature monitoring in hydronic

5°F at 75°F—to the comfort control module

If the blower is running but the switch remains open

the furnace control board may fail to proceed to the ignition sequence

Trane THT3044 Limit Switch 319825-402 The Honeywell 50001774-001 is aThe Trane THT3044 is a critical safety grade OEM limit switch engineered to provide precise thermal protection in residential and commercial HVAC furnaces, air handlers, and gas fired heating systems. As a 200F high limit control, this manual reset limit switch is programmed to interrupt the electrical circuit if the internal plenum temperature reaches the 200F threshold, preventing catastrophic equipment failure and ensuring safe operation. This