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The 0130M00105 is a genuine OEM defrost thermostat (coil temperature sensor) for the Goodman ASZ130301AH 13 SEER, 2.5-ton heat pump. Clamped to the outdoor coil tubing, this snap-disc thermostat closes at a preset temperature and signals the defrost board to initiate a defrost cycle, then opens to terminate it once the coil clears. When it fails, the outdoor coil ices over in heating mode — killing capacity and risking compressor damage — or the unit runs needless defrost cycles that waste energy.
The OEM 0130M00105 is calibrated to Goodman's exact close/open temperature setpoints for the ASZ13 defrost strategy. Generic snap-discs may carry different trip points, causing premature or delayed defrost. Because this part directly governs winter performance, the factory-calibrated OEM sensor is the safe choice.
Moderate (2/5) — No refrigerant work. Kill power at the disconnect, unclip the old thermostat from the coil, transfer the two low-voltage leads to the new sensor, and clip it to the same tube location for accurate sensing. A confident DIYer can handle it; verify a proper defrost cycle afterward.