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The Goodman B1378700 is the genuine OEM 16-pin wiring harness for the APH1524M41AB heat pump. This pre-terminated control loom links the main control board to the unit's sensors, reversing valve, defrost circuit, and low-voltage components through a keyed 16-position connector. Melted pins, corroded terminals, chewed insulation, or intermittent connections in the original harness cause erratic operation, no-heat/no-cool faults, and board communication errors. This factory harness restores clean, reliable connections.
Wiring harnesses are model-specific in pin count, wire color code, gauge, and connector keying. A generic harness risks miswiring, incorrect polarity, or a connector that won't seat. This genuine OEM harness matches Goodman's exact pinout and plug for a plug-and-play swap.
Rated Moderate — no refrigerant work, but you must disconnect power, photograph and label routing, and confirm each connector seats fully. Careful, methodical handling of the low-voltage circuit is required.