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The Goodman 11177113 Combination Pressure Switch is a genuine OEM dual-setpoint safety switch for AMV90704CXAB gas furnaces and compatible Goodman/Amana models. Rated at -.30" WC and -.75" WC, this gray combination switch proves adequate draft and venting before the furnace is permitted to ignite, protecting your home from unsafe combustion conditions.
When a pressure switch drifts out of calibration or fails, the furnace typically locks out with a pressure-switch fault code and will not heat. Replacing it with the correct factory-rated switch restores safe, reliable ignition sequencing.
Our Genuine OEM Goodman switch is calibrated to the exact factory trip points, which is critical for a safety device. Generic switches with slightly different setpoints can cause nuisance lockouts or, worse, fail to detect venting problems. For a combustion safety component, always use OEM.
Disconnect power and gas before servicing. Note the wiring and hose connections, transfer them to the new switch in the same orientation, and mount it securely. Confirm no cracked hoses and test the full ignition cycle. A licensed HVAC technician is recommended for safety-circuit work.