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The 10135604 is a genuine OEM switching relay used in the Goodman ASH130421AB heat pump. Relays like this handle the electrical switching that turns key components on and off on command from the control board or thermostat — energizing loads such as the outdoor fan, auxiliary circuits, or accessory controls. A worn or chattering relay can cause intermittent operation, a unit that won't start, or components that fail to energize, so replacing a suspect relay is a fast, low-cost way to restore reliable operation.
The OEM 10135604 is matched to Goodman's coil voltage and contact rating, giving you a drop-in replacement with dependable switching life. Generic relays may share a form factor but can differ in coil voltage or contact amperage, leading to premature failure or nuisance faults. For the correct rating every time, choose the OEM part.
Easy — this is one of the simplest heat pump repairs. Kill power at the disconnect, note the wire positions, unplug the old relay, and snap the new one into place. Typically a 10–15 minute job. When in doubt about which relay has failed, a technician can confirm with a multimeter.