Why is my Reznor heater tripping the high limit switch

The Resideo DP3030A5004 PowerPro Definite Purpose Contactor is a field-proven 3-pole HVAC contactor engineered for heavy-duty switching of induction motors in residential and commercial systems

including Intertherm and Miller

Comprehensive Kit: Includes the IFC control board

Universal Compatibility: Directly replaces CSA200 series inserts in various housing types

Lochinvar & A.O. Smith 100208513 Module 319825-402 Why is my Reznor heaterThe Lochinvar & A. O. Smith 100208513 Module is a critical intermittent pilot ignition control engineered for high performance gas fired boilers and commercial water heaters. This OEM ignition module (cross referenced as Honeywell S8610U3009) manages the sequence of operation for the pilot flame, main burner, and flame rectification. Built for reliability in demanding mechanical rooms, it operates on a standard 24 VAC control voltage and supports both