or the motor "humming" without starting

If the pressure switch fails to close despite a functional inducer motor

making it an essential item for any direct vent furnace repair kit

the gasket loses its ability to reseal effectively

the 12A09 is specifically certified and sized for Maxitrol 325-3 and 325-3L series models

Reznor 125401 Sensor Lead Assembly or the motor "humming" withoutThe Reznor 125401 Sensor Lead Assembly is a critical OEM component designed for precise signal transmission between the flame sensor and the integrated ignition control board. Engineered for high temperature environments typical of industrial gas fired unit heaters, this lead wire assembly ensures minimal impedance and consistent continuity to prevent nuisance drop outs or ignition failure. When troubleshooting a Reznor unit heater that fails to