OEM Lennox Heat Pump Fan Motor — Y4904

The OEM Lennox Y4904 fan motor is designed specifically for Lennox heat pump outdoor units, driving the fan that moves air across the coil in both cooling and heating modes. Because heat pumps run year-round, this motor is built to Lennox specifications for durable, reversible-season operation with the correct horsepower, speed, rotation, and shaft dimensions for a precise drop-in fit.

Common failure symptoms include a fan that hums but won't spin, slow or stalling blades, overheating that trips the thermal overload or breaker, bearing noise, and loss of heating or cooling output. In heat pump service this is especially critical — poor airflow during winter can hinder defrost cycles and cause ice buildup on the outdoor coil, while summer failures raise compressor head pressure.

OEM matters most on hard-working heat pumps. Aftermarket motors often lack the matched capacitor rating, duty cycle, or bearing quality needed for continuous seasonal use, leading to early failure and possible warranty loss. The factory-specified Y4904 restores your Lennox heat pump's designed airflow, efficiency, and dependable all-season performance.