York S1-7945-3551 Transformer If the indicator shows permanent

If the indicator shows permanent discoloration or the glass is compromised

Using a switch with a different set point can lead to unsafe combustion or frequent short cycling of the heating system

such as confirming the contactor's state to a PLC or managing a secondary circuit without adding significant electrical stress to the primary control components

Direct Cross Reference: Perfectly replaces legacy part number 1149252 without modifying wiring or brackets

What does it mean if my Lennox furnace is showing a blocked vent error

York S1-7945-3551 Transformer If the indicator shows permanentThe York S1 7945 3551 Transformer is a critical OEM replacement part designed for precision voltage regulation in York, Coleman, and Evcon HVAC systems. This 120V to 24V step down transformer features a 15VA power rating, providing a stable low voltage current to reach the control board, contactors, and thermostats. Built as a Class 2 transformer, it ensures proper isolation for the secondary circuit, protecting sensitive electronic components from