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The Goodman 0151R00069SP Reversing Valve is a genuine OEM 4-way valve assembly for WGHP4336AAA heat pump systems. The reversing valve is the heart of heat-pump operation: a solenoid-piloted slide shifts the refrigerant flow path to switch the system between heating and cooling modes and to run the defrost cycle. A stuck or leaking valve causes a heat pump that won't change modes, blows cold air in heat mode, or loses capacity in both modes.
The OEM 0151R00069SP is matched to this unit's tonnage, tube sizing, and solenoid voltage, so it switches reliably without pressure-drop penalties. Undersized aftermarket valves restrict flow and can fail to shift under low ambient conditions. For the most failure-prone refrigerant component in a heat pump, OEM is the right call.
Difficulty: Advanced (EPA 608 certification required). Replacement requires refrigerant recovery, careful brazing with a heat sink to protect the solenoid, evacuation, and recharge. This is a licensed-technician job.