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The Goodman PCBDM101S is a genuine OEM defrost control circuit board built for the ASH130181AB heat pump. This board is the brains of the outdoor unit's heating operation — it monitors coil temperature, runs the timed/demand defrost cycle, energizes the reversing valve solenoid, and coordinates the outdoor fan and compressor contactor so the unit sheds frost without dumping cold air into the home.
Defrost logic, jumper timing options, and terminal pin-out are model-specific. The OEM Goodman PCBDM101S is a plug-in match with the correct firmware behavior and relay ratings. Aftermarket boards can misread the defrost thermostat or mis-time the reversing valve, causing icing or no-heat calls.
Replacement means labeling and transferring low- and line-voltage connections one at a time and setting the defrost timing jumper to match the original. Always kill power at the disconnect first. A handy DIYer can manage it, but wiring accuracy is critical.