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The Goodman PCBDM101S Defrost Control Board is a genuine OEM circuit board for the ASH130481AA heat pump. This board is the brain of the outdoor unit's defrost logic — it monitors the defrost thermostat, times the defrost interval, energizes the reversing valve, and cycles the outdoor fan and compressor to shed ice from the coil in cold weather. Symptoms of a failed board include a coil that ices over, no defrost cycle, or the unit failing to switch between heating and cooling.
Aftermarket boards often lack the exact relay ratings, terminal layout, or defrost-timing options of the original, forcing rewiring and risking nuisance faults. This genuine OEM PCBDM101S is a plug-for-plug match with the correct terminal designations, so factory wiring reconnects exactly as it came off.
Intermediate (3/5). No refrigerant work, but careful. Photograph the wiring, disconnect all power, transfer leads one at a time to the matching terminals, and set the defrost-time jumper. Typically 30–45 minutes for a technician.