OEM Goodman -0.33" WC NO Pressure Switch WGGE4330A045MAB — 11112501S

The Goodman 11112501S Pressure Switch is the genuine OEM air-proving switch for WGGE4330A045MAB gas package units. This normally-open switch closes at -0.33 in. WC of negative pressure to confirm the inducer draft motor is moving combustion air before the control board allows ignition. A failed or drifted switch is one of the most common causes of a furnace that clicks but never lights, or that lights and short-cycles on lockout.

Specifications

• OEM Part Number: 11112501S
• Type: Single-stage air/draft pressure switch
• Set Point: -0.33 in. WC (negative)
• Contact Configuration: Normally Open (NO)
• Port: Single hose barb
• Fits: Goodman WGGE4330A045MAB and related models

OEM vs. Generic

This safety switch is calibrated to the exact -0.33" set point the WGGE4330 combustion system is engineered around. Generic switches with a nearby set point may seem to work but can nuisance-trip in wind, mask a real venting problem, or fail to prove draft — defeating the purpose of the safety. Because it's a combustion-safety component, we recommend the OEM-calibrated part.

Install Difficulty

Easy — typically 15–20 minutes. Kill power, unplug the two spade terminals, pull the single sensing hose, unscrew the bracket, and reverse. Verify the hose is clear of condensate and free of kinks on reassembly. A confident DIYer can do this; if the furnace still won't prove draft after replacement, have a technician check the inducer and venting.