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The Goodman 0130M00105 Defrost Thermostat is a genuine OEM temperature-sensing switch that is a direct-fit replacement for the ANZ130301AA heat pump. Clipped to the outdoor coil, it closes and opens at preset temperatures to tell the defrost control board when frost has built up and when the coil is clear. If this thermostat fails, the unit either skips defrost (icing over and losing heat) or defrosts constantly (wasting energy and short-cycling), so a correct-spec sensor is essential to winter heat-pump operation.
The Goodman sensor is calibrated to the exact close/open temperatures your defrost board expects. Generic defrost thermostats often use different setpoints or lead lengths, causing nuisance defrosts or missed cycles. The OEM part guarantees the board sees the right signal.
Moderate — comfortable DIYer or technician. No refrigerant work is required, but power must be disconnected, the coil clip relocated to the same tube, and the low-voltage leads reconnected to the correct terminals. Basic hand tools and a wiring diagram recommended.