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The Goodman B1378700 16-Pin Wiring Harness is a genuine OEM main control harness built for the APH1560M41BA package heat pump. This 16-position harness links the control board to key low-voltage and switching components, carrying signal and power between the board and the unit's sensors, relays, and motor controls. Melted connectors, chafed insulation, or corroded pins cause intermittent faults, no-heat/no-cool calls, and error codes — a fresh OEM harness eliminates flaky connections.
OEM vs. Generic: Wiring harnesses are not universal. The B1378700 uses the exact connector housing, keying, wire gauge, and pin assignment the APH1560 control board expects. Generic pigtails require cut-and-splice work that introduces resistance and failure points. The factory harness keeps the low-voltage circuit clean and code-compliant.
Installation Difficulty: Moderate (3/5). Kill power at the disconnect, photograph the existing routing, unplug the old harness at both ends, route the new harness along the same path, and reconnect. No wire cutting needed. Roughly 30–45 minutes. Confirm connectors click fully seated before energizing.