OEM Carrier 2-Stage Gas Valve EF33CW204 for Model PG9UAA042080AASA

This OEM combination gas valve is the factory-specified replacement for the Carrier PG9UAA042080AASA gas furnace. Manufactured by White-Rodgers (model 36J55-503), it is a 2-stage valve that regulates natural gas flow through both low-fire and high-fire stages, allowing the furnace to modulate heat output for maximum efficiency and comfort. When this valve fails, the furnace will typically lock out after an ignition attempt with no gas flow, produce a fault code for gas valve failure, or fail to transition from low-stage to high-stage firing — leaving the home without heat.

• Specs: 24V coil voltage | 0.430A draw | 2-stage (low/high fire) | Natural gas | White-Rodgers 36J55 Type 503 | Replaces OEM part number EF33CW191
• OEM vs Generic: This is a genuine Carrier OEM part, factory-matched to exact design life, pressure ratings, and safety certifications for the PG9UAA042080AASA. Aftermarket valves may not meet OEM pressure specifications, risking unsafe operation or voided equipment warranty.
• Install difficulty: 3/5 — Gas valve replacement requires shutting off the gas supply and 24V power before beginning. Tools needed: adjustable wrench, pipe thread sealant, manometer for gas pressure verification, and multimeter. Always perform a leak test after installation. A qualified technician is strongly recommended.
• Warranty: 1-year OEM factory warranty. In-stock and ships same business day from our warehouse.

Compatibility: Engineered as a direct drop-in replacement for Carrier model PG9UAA042080AASA. Verify your unit's gas type (natural gas) and voltage (24V) on the data plate before ordering. Cross-references: EF33CW191 (superseded). Need fitment confirmation? Our HVAC parts team will verify compatibility before you order — order now and receive same-day shipping on in-stock parts.