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The 10135604 is a genuine Goodman control relay built for the WGHP4460AAE packaged heat pump. Relays are the electromechanical switches that let low-voltage thermostat and board signals safely control higher-current loads like blowers, auxiliary heat, and compressor contactors. When a relay's contacts pit, stick, or chatter, you get intermittent cooling/heating, components that won't energize, or a unit that runs when it shouldn't. Replacing it with the exact OEM relay restores correct switching behavior and protects downstream components.
The genuine Goodman 10135604 matches the original coil voltage, contact rating, and terminal layout, so it drops into the existing harness without rewiring or adapters. Generic cross-references can differ in coil rating or contact configuration, risking nuisance trips, premature contact wear, or board damage. OEM is the safe, no-guesswork choice for a control component.
Replacement requires disconnecting power at the breaker, photographing or labeling the wiring, and transferring leads to the matching terminals. Basic electrical knowledge and a multimeter are recommended. If you're not comfortable verifying coil voltage and contact continuity, have a licensed HVAC technician perform the swap.