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The Goodman B1378701 is a factory 5-pin wiring harness engineered for the APH1530M41AB heat pump and compatible Goodman/Amana air-handler and outdoor-unit platforms. This harness carries low-voltage control and sensor signals between the control board and downstream components, using a keyed 5-pin connector so it can only seat one way — eliminating miswiring during service.
Our OEM Goodman B1378701 uses factory-spec connectors, wire gauge, and terminal crimps that match your board's pin-out exactly. Generic or hand-built harnesses often use undersized wire or loose terminals that cause intermittent faults and hard-to-diagnose control errors. For a component this critical to the control circuit, the genuine part is the reliable choice.
Difficulty: Easy (1/5). Disconnect power at the breaker, unplug the old harness at both ends, route the new harness along the original path, and click each connector into place. No tools or crimping required. Typical install time is 5–10 minutes. Always confirm power is off before servicing.
Genuine Goodman part — backed by fast shipping and correct-fit assurance for your APH1530M41AB system.