While some residential boards are cross-compatible

5 duct diameters downstream of the air source for the most stable readings

Solid base design ensures a stable

a full replacement of the HC21ZE125 is the standard industry practice to restore system safety and functionality

Integrated Temperature Protection: Dual-limit monitoring for discharge air ensures safe operation and protects downstream ductwork and components

York S1-073-12892-702 Tube R-407A While some residential boards areThe York S1 073 12892 702 Carryover Tube is a precision engineered OEM replacement part designed for reliable flame propagation across burner assemblies in York, Coleman, and Evcon gas fired equipment. This metal carryover tube ensures consistent ignition by bridging the gap between burners, preventing delayed ignition and maintaining optimal combustion efficiency. Built to withstand high temperature environments and the rigors of repetitive heating