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The genuine OEM Lennox R100040-33 is a Copeland ZP21K5E-PFV-830 scroll compressor rated at 21,300 BTUH, 208/230V, single-phase, for R-410A systems. Built on Copeland's proven Scroll platform and factory-specified by Lennox, this compressor pressurizes refrigerant vapor to move heat through your outdoor unit. The scroll design offers fewer moving parts, quieter operation, and higher efficiency than reciprocating compressors.
Common failure symptoms: the system fails to cool, the outdoor unit buzzes but the compressor won't start, breakers trip, the unit short-cycles on thermal overload, discharge lines run abnormally hot, or you hear grinding and rattling. Electrical readings showing an open, shorted, or grounded winding confirm a failed R100040-33.
Why OEM matters: Lennox validates this exact Copeland compressor for the unit's capacity, oil type, and electrical profile. The OEM R100040-33 ensures a correct match, protecting efficiency ratings and manufacturer warranty while avoiding the premature failures common with unmatched aftermarket compressors. Always recover the old charge, replace the filter drier, evacuate the system, and weigh in the correct R-410A charge.