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The B1378700 is a genuine OEM 16-pin wiring harness for the Goodman/Amana APH1560M41CA packaged heat pump. This pre-terminated harness carries low-voltage control signals between the integrated control board and the unit's components, landing in a keyed 16-pin connector for a mistake-proof connection. Cracked insulation, corroded pins, or melted connectors cause intermittent operation, communication faults, and no-heat/no-cool calls — a fresh harness restores reliable signaling.
The OEM B1378700 uses the correct pin-out, wire gauge, colors, and connector keying, so it plugs directly into the factory board with no splicing or re-pinning. A generic or hand-built harness invites wiring errors, pin mismatches, and warranty issues, and rarely matches the exact 16-pin layout.
Easy. No refrigerant work — disconnect power, unplug the old harness, route the new one along the factory path, and seat both connectors until they click. Usually 20–40 minutes; photograph connections first if any leads are individually terminated.