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The Goodman 10135604 Defrost Relay is a genuine OEM replacement component engineered for the ASZ130301AD heat pump and other compatible Goodman and Amana condensing units. This relay switches control-circuit power during the defrost cycle, allowing the reversing valve and auxiliary heat to engage so ice can clear from the outdoor coil. A failed relay is a common cause of a heat pump that freezes over, short-cycles, or fails to switch out of defrost.
The OEM Goodman relay is factory-matched for exact contact ratings and terminal layout, ensuring reliable long-term operation and preserving equipment warranty coverage. A generic equivalent offers a lower-cost alternative with comparable switching specs, ideal for budget-conscious repairs, though tolerances and lifespan may vary slightly. Both mount in the same location using existing terminals.
Easy (2/5) — A basic swap for a technician or handy homeowner. Disconnect power at the breaker, photograph and transfer the wire terminals one at a time, and clip the relay into place. Always confirm power is off with a meter before servicing. Professional installation recommended if you are unfamiliar with control wiring.