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The Goodman 0130M00105 Defrost Thermostat is a genuine OEM temperature switch that signals the defrost control board on Goodman ANZ130181AA heat pumps. Clamped to the outdoor coil, it senses when the coil temperature drops low enough to accumulate frost and closes its contacts to initiate a defrost cycle, then opens to terminate it once the coil warms. A failed defrost thermostat is a frequent cause of iced-over coils, poor heating performance, and short-cycling in cold weather.
The OEM thermostat is calibrated to Goodman's specific close/open temperature setpoints for the ANZ130181AA defrost logic. Generic substitutes with different trip points can cause premature or missed defrost cycles, wasting energy and stressing the compressor. Correct calibration matters — OEM keeps defrost timing accurate.
Moderate (3/5). Requires removing the access panel, unclipping the sensor from the coil, and transferring the wire leads to the new switch. Kill power first and note the mounting location so the replacement contacts the coil at the same point.
Order the OEM defrost thermostat for your ANZ130181AA from National HVAC Parts.