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The Goodman 0130M00075 Low Pressure Switch is a genuine OEM safety control for the APH1636H41BA heat pump. Installed on the low-side (suction) refrigerant line, it interrupts the compressor circuit when suction pressure drops too low — guarding against loss-of-charge, restricted metering, and frozen-coil conditions that would otherwise slug or overheat the compressor. When this switch fails, the system may short-cycle or refuse to run; the OEM part restores the correct low-pressure protection.
This genuine Goodman OEM switch ships with the factory-correct low-pressure trip and reset set points. Aftermarket switches frequently use generic thresholds that either nuisance-trip in cold weather or fail to catch a low charge. For compressor protection, OEM calibration is essential.
Difficulty: Moderate (EPA certification required). Spade-terminal wiring is straightforward, but if the switch is brazed into the refrigerant circuit, recovery, replacement, and evacuation must be done by an EPA-certified technician. Always disconnect power before servicing.