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The Goodman B1378700 16-Pin Wiring Harness is a genuine OEM control harness for the APH1560M41AA heat pump. It carries the low-voltage and control signals between the unit's control board and its components through a single keyed 16-pin connector. Cracked insulation, corroded terminals, or melted pins cause intermittent faults, no-heat/no-cool calls, and hard-to-diagnose control errors. This plug-and-play harness restores clean, reliable connections with the correct factory pinout.
The OEM harness guarantees the exact connector keying, pin assignments, wire gauge, and lead lengths your control board expects. A generic or hand-spliced harness risks mis-pinned circuits, voltage drop, or connector mismatch that can damage the board. For a signal-carrying part, OEM eliminates the guesswork.
Difficulty: Moderate. Disconnect power, photograph the existing routing, unplug the keyed connector, and swap in the new harness following the same path. Because it is a keyed connector, mis-plugging is unlikely, but verifying each terminal seat is recommended. Typically 20–30 minutes for a technician.