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The Goodman PCBDM101S Defrost Control Board is a genuine OEM replacement for the Goodman ASH130601AB heat pump. This circuit board is the brain of the outdoor unit's defrost cycle — it monitors coil temperature and run time, energizes the reversing valve, and controls the compressor contactor and outdoor fan to clear frost from the coil in heating mode. A failed defrost board leads to iced-up coils, no heat, short cycling, or a fan and compressor that won't respond correctly.
The genuine PCBDM101S is programmed with the exact defrost logic, timing options, and relay ratings Goodman engineered for this platform, and its terminal layout matches the factory harness for a plug-in swap. Aftermarket boards may require rewiring or have different timing behavior that leaves the coil frosting. For correct defrost operation, the OEM board is the reliable choice.
Difficulty: Moderate. With power off, photograph the existing wiring, transfer connectors one at a time to the matching terminals on the new board, and set the defrost timing jumper to match the old board. Mount and secure the board. Budget 30–45 minutes. If terminals differ, follow the unit's wiring diagram. Disconnect power at the breaker and disconnect before servicing.