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The Goodman B1378701 is a genuine OEM 5-pin wiring harness engineered as a direct replacement for the Goodman/Amana APH1624H41AA packaged heat pump. This smaller harness links a specific subassembly — such as a sensor, motor, or switch circuit — to the control board through a keyed 5-position connector. When pins overheat, terminals corrode, or a lead breaks, the affected component drops offline and can trip fault codes. Replacing the harness with the correct OEM part restores a solid, weather-tight connection.
The OEM B1378701 ships pre-terminated with the exact connector keying and wire gauge your unit expects, so it plugs in without splicing. Generic pigtails force hand-crimping and can seat incorrectly on a 5-pin header. The genuine part guarantees polarity and fit.
Rating: Easy to Moderate. Kill power at the disconnect, unplug the old 5-pin connector, route the replacement along the factory path, and press it home until it clicks. Basic hand tools; reference the unit wiring diagram and photograph before disconnecting.
Confirm OEM part number B1378701 on your service label to verify APH1624H41AA fit before purchase.