Fenwal 22-100000-540 Ignitor Sensor Els PW 17895 What causes this limit switch

What causes this limit switch to trip prematurely

the 512-200-000 stainless burner offers a direct-drop replacement that maintains the integrity of the original gas burner assembly without the need for field modifications

including both tri-state (floating) and proportional (0-10 VDC/4-20 mA) models

This orifice is suitable for R404A

this relay provides an exact drop-in fit for legacy air handlers and furnace units

Fenwal 22-100000-540 Ignitor Sensor Els PW 17895 What causes this limit switchThe Fenwal 22 100000 540 Ignitor Sensor is a high performance silicon carbide igniter designed for precise ignition and flame sensing in gas fired heating systems. Engineered for durability, this hot surface ignitor utilizes a robust ceramic base and specialized terminal connections to ensure consistent performance in high temperature environments. As a critical HVAC replacement part, it is frequently utilized in commercial and industrial furnaces,