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The Goodman 0130M00075 is a genuine OEM low-pressure switch for the APH1436H41DB heat pump. Installed on the suction (low) side of the refrigerant circuit, it opens the compressor control circuit when suction pressure drops too low — the classic signature of a refrigerant leak, loss of charge, or a restricted metering device. By cutting the compressor before it runs starved of refrigerant, this switch prevents overheating and expensive compressor failure. A faulty low-pressure switch can cause no-cool/no-heat lockouts or let the compressor run unprotected; a new OEM switch restores proper loss-of-charge protection.
The OEM 0130M00075 carries Goodman's exact low-side cut-out and reset setpoints. Substitute switches with different pressures can nuisance-trip in cold weather or fail to protect against a slow leak. For a compressor-protecting safety device, factory calibration matters — go OEM.
About 20–30 minutes. Disconnect the leads, swap the switch on its port, and reconnect. Shut off power and observe proper refrigerant-handling procedures before servicing.