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The Goodman 0130M00075 is a genuine OEM low-pressure switch for the WPH4460AHAB package heat pump. Installed on the suction (low) side of the refrigerant circuit, it opens the compressor control circuit when suction pressure drops too low — a sign of loss of charge, a leak, or restricted refrigerant flow. This loss-of-charge protection prevents the compressor from running in a starved condition that would overheat it and burn out the windings.
Genuine Goodman calibration sets the correct low-pressure cut-out and cut-in points for the WPH4460 circuit. A generic switch with the wrong setpoints can short-cycle the compressor or leave it unprotected during a slow leak. The OEM part guarantees factory-spec protection.
Intermediate / Professional recommended. The switch threads onto a suction-side port and wires into the compressor control circuit. Refrigerant recovery may be required depending on the fitting, so use a licensed HVAC technician.