OEM Carrier 2-Stage Gas Valve EF33CW204 for Model PG9MXA060120AASA

This is the factory OEM replacement combination gas valve for the Carrier PG9MXA060120AASA gas furnace. Manufactured by White Rodgers (model 36J55-503), this 2-stage valve precisely regulates natural gas flow at two firing rates — low-stage for efficient partial-load heating and high-stage for maximum heat output on the coldest days. When this valve fails, the furnace will typically enter a no-heat lockout condition: the inducer and igniter will cycle, but no gas will flow, resulting in repeated ignition attempts with no flame establishment and ultimately a hard lockout fault code.

• Specs: 2-Stage Natural Gas | 24V AC coil | 1/2" NPT inlet × 1/2" NPT outlet | Hi-stage: 3.5" W.C. | Lo-stage: 1.5" W.C. | Replaces OEM P/N EF33CW191
• OEM vs Generic: This is a genuine Carrier OEM part — not an aftermarket substitute. OEM valves are factory-tested to exact pressure and flow specifications for the PG9MXA060120AASA. Aftermarket valves may not hold precise W.C. tolerances, risking unsafe combustion or nuisance lockouts.
• Install difficulty: 3/5 — Gas valve replacement requires shutting off gas supply, relieving line pressure, and verifying gas-tight connections with leak-check solution after installation. Tools needed: adjustable wrench, pipe thread sealant (gas-rated), manometer for pressure verification, multimeter. Always follow local code and manufacturer safety instructions. A licensed technician is recommended.
• Warranty: 1-year OEM factory warranty. In stock and ships same business day from our warehouse.

Compatibility: Direct OEM replacement for Carrier model PG9MXA060120AASA gas furnace. Supersedes previous part number EF33CW191. Verify your unit's gas type (natural gas) and inlet/outlet pipe size before ordering. Have your model and serial number ready — our HVAC parts specialists are available to confirm fitment before you purchase.