Trane CAB1157 Control 322838-754 Environmental Lockouts: Prevents the intake

Environmental Lockouts: Prevents the intake of air that is too hot

Set your multimeter to the DC microamp (µA) scale and connect it in series between the flame sensor terminal and the control board wire

allowing for variable heat output rather than simple on/off cycling

or a complete lack of movement despite receiving a 24V signal on the G terminal

the 257010 serves as a direct replacement for obsolete part numbers 89488 and 89314

Trane CAB1157 Control 322838-754 Environmental Lockouts: Prevents the intakeThe Trane CAB1157 is a critical OEM wire harness designed for precise power distribution and signal transmission within commercial and residential HVAC systems. Functioning as the primary power control cable, this component ensures seamless communication between the main controller and peripheral hardware like sensors or mechanical relays. Built to Trane technical specifications, the assembly features a 2 x 3 plug configuration combined with