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The Goodman 0130M00075 Low Pressure Switch is the OEM suction-side safety control for APH1436M41AA packaged heat pumps. It monitors low-side pressure and opens the control circuit to stop the compressor on a loss-of-charge or abnormally low suction condition — guarding against compressor damage from running with insufficient refrigerant, a restriction, or a frozen coil — and auto-resets when pressure recovers.
The genuine switch is calibrated to this unit's low-side cut-out and reset setpoints. Aftermarket switches with different setpoints can either nuisance-trip in cold weather or fail to protect the compressor. Because this is a protective control, matching the OEM specification is the recommended path.
Moderate (3/5). Typically threads onto a Schrader-style port, so many replacements need no refrigerant recovery — but the depressing-pin design briefly opens the low side, so EPA 608 handling practices apply. Brazed variants require recovery and evacuation.
Fitment note: confirm model/serial and fitting type before ordering.