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Part 0130M00075 is the genuine OEM low-pressure switch for the Goodman APH1436H41DD heat pump. Mounted on the low (suction) side, it protects the compressor from running against a loss of charge, a refrigerant leak, or a blocked metering device by opening the control circuit when suction pressure drops too low. A failed or out-of-calibration switch shows up as a compressor that won't start or short-cycles on the low-pressure trip.
The OEM switch is calibrated to Goodman's exact cut-in/cut-out pressures and uses the correct fitting for this circuit. A generic substitute with a different setpoint can mask a real charge problem or nuisance-trip in cold weather. For proper protection choose the genuine part.
Moderate (3/5). Connects to the sealed system; Schrader-mounted versions replace without recovery, brazed versions need recovery and evacuation by an EPA-certified tech. Always cut power before servicing.