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The Goodman PCBDM101S Defrost Control Board is the OEM circuit board that runs the defrost cycle on the ASH130241AD heat pump. It reads the coil temperature sensor, times the defrost interval, switches the reversing valve, and cycles the outdoor fan and auxiliary heat — the brain behind reliable winter operation. Symptoms of failure include ice buildup on the outdoor coil, no defrost, or the unit locking out in heat mode.
The OEM board matches the connector pinout, relay ratings, and defrost logic this model expects, so wiring transfers over directly. Aftermarket boards may require rewiring and jumper changes and can mis-time defrost. Given the diagnostic complexity, OEM is the reliable choice.
Moderate (3/5). Power down, photograph the wiring, transfer each labeled connector to the new board, set the defrost timing jumper to match the original, and mount. Plan for 30–45 minutes.
Always kill power at the disconnect and breaker first. Professional installation recommended.