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The Goodman B1378700 16-Pin Wiring Harness is a genuine OEM wiring assembly for the Goodman APH1530M41BA heat pump and compatible Goodman/Amana systems. This 16-position harness carries low-voltage control and sensor signals between the main control board and the unit's components. Melted connectors, corroded pins, or chewed insulation cause intermittent faults, error codes, and no-heat/no-cool calls — a fresh factory harness restores reliable communication.
Genuine OEM Goodman harnesses use the correct wire gauge, connector keying, and pin locations so the plug seats the first time. Generic pigtails require cutting, splicing, and re-pinning, which invites miswiring and future connection failures. OEM is the safe, plug-and-play choice for control circuits.
Moderate (2 of 5) — Disconnect power, photograph the existing routing, unplug the keyed connectors, and swap the harness one plug at a time. No soldering required. Allow 30–45 minutes and verify each connector clicks fully home before restoring power.