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The Goodman 10135604 relay is a genuine OEM switching component for the WGHP4430AAE air conditioner / heat pump. The relay opens and closes the control circuit that energizes a major load — such as the fan, heater, or reversing valve circuit — in response to the control board or thermostat signal. A failed relay shows up as a component that won't energize, chattering contacts, or erratic cycling, and replacing it restores dependable switching.
The OEM Goodman relay guarantees the correct coil voltage, contact rating, and terminal layout for a direct fit. Generic equivalents may save money but require verifying coil voltage and contact amperage match the original. For control-circuit reliability, OEM is recommended.
Moderate — disconnect power, label and transfer the wiring leads to the matching terminals, and mount securely. A wiring diagram and multimeter are helpful for verification. Professional installation recommended for electrical work.