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The genuine Goodman 10135604 relay is a factory OEM control component engineered for the Goodman WGHP4442AAD packaged heat pump. The relay switches power to the unit's fan motor or compressor circuit on a signal from the control board or thermostat, and a worn or chattering relay is a common cause of a unit that won't start, short-cycles, or trips on contact failure. Installing the exact OEM part ensures the coil voltage, contact rating, and pin layout match your equipment so you avoid the guesswork of universal substitutes.
OEM vs. Generic: Generic relays may carry a similar contact rating but often differ in coil voltage tolerance, terminal spacing, and mounting footprint. This genuine Goodman relay is built to the original specification, so it drops into the existing harness and bracket without modification and maintains the unit's UL listing.
Install Difficulty: Easy — a typical 15–20 minute repair for a technician or a confident DIYer. Always disconnect power at the breaker before servicing. Photograph the wiring before removing leads and transfer them one at a time to the new relay.