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The genuine OEM Lennox 91W10 is a Copeland ZPS40K5E-PFV-830 two-stage scroll compressor rated at 38,700 BTUH, 208/230V, single phase, for R-410A applications. As the core component of your Lennox outdoor unit, it compresses and circulates refrigerant to move heat out of your home, while the ZPS UltraTech design enables efficient part-load operation for better comfort and lower energy use.
Common failure symptoms: A worn or failed compressor often hums without starting, trips the circuit breaker, delivers weak or no cooling, runs nonstop, or produces loud mechanical noise. Locked rotor conditions and internal electrical faults such as open, shorted, or grounded windings are the most common reasons for replacement.
Why OEM matters: Because R-410A runs at high pressures, the compressor must precisely match your Lennox system's displacement, POE oil charge, and electrical specifications. The OEM 91W10 restores factory capacity and efficiency, keeps two-stage control functioning correctly, and preserves warranty coverage. Replace the liquid line filter drier and pull a proper vacuum before charging.