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The Goodman PCBDM101S is the genuine OEM defrost control board for the ASH130181AA heat pump. This board is the brain of the outdoor unit's heat-mode operation — it monitors the defrost thermostat, times the defrost cycle, energizes the reversing valve and auxiliary heat, and controls the compressor contactor. A failed PCBDM101S typically shows up as ice buildup on the coil, no defrost, or a unit that won't switch between heating and cooling.
Aftermarket universal defrost boards require re-jumpering and often can't replicate Goodman's exact terminal layout or timing logic, leading to short-cycling or improper defrosts. The OEM PCBDM101S is a plug-in match for the original harness and preserves the factory defrost algorithm for efficient, reliable cold-weather operation.
Rating: Moderate. With power off at the disconnect, photograph and label all wire connections, transfer leads one at a time to the new board, and set the defrost timing jumper to match the old board. Typically a 30–45 minute job. Working near 240V; if unsure, use a licensed HVAC technician.
Genuine OEM control reliability with fast shipping from National HVAC Parts.