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The 0130M00105 defrost thermostat is a critical sensing switch on the Goodman ASZ130241AE 13 SEER, 2-ton heat pump. Clamped to the outdoor coil, it monitors coil temperature and signals the defrost board to initiate and terminate the defrost cycle, clearing frost buildup in cold weather. A failed thermostat causes iced-over coils, weak heating, and short-cycling — this genuine OEM sensor restores correct cut-in/cut-out temperatures.
Generic defrost switches frequently carry the wrong cut-in/cut-out set points, which either wastes energy defrosting too often or lets the coil ice up. The OEM 0130M00105 is calibrated to Goodman's exact defrost logic for this platform, ensuring efficient, reliable winter operation.
Easy-to-Moderate (2/5). Kill power at the disconnect, unclip the old thermostat from the coil, transfer the two wire leads to the new switch, and re-clamp it to the same tube location. Around 20 minutes for a comfortable DIYer.