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The Goodman 11177113 Combination Pressure Switch is a genuine OEM dual-diaphragm draft safety control for the AMV90704CXBB gas furnace and compatible Goodman/Amana two-stage models. This gray-bodied switch combines two set points — -.30 in. W.C. and -.75 in. W.C. — to confirm proper venting and inducer draft at both low- and high-fire before the control board allows ignition. A failed pressure switch is one of the most common causes of a furnace that clicks but will not light.
The OEM Goodman switch is factory-calibrated to both trip points and uses the correct port fittings and electrical terminals for a plug-and-play swap. Generic alternatives may only approximate the set points, risking false lockouts or bypassed safety limits. Because this is a combustion safety device, we strongly recommend OEM.
Moderate (20–30 min). Power down the furnace, label and transfer the tubing to the matching ports, move the wire spades to the same terminals, and mount the switch. Confirm the inducer pulls both switches closed on a call for heat. Recommended for experienced DIYers or an HVAC technician.