OEM Carrier Gas Valve 24V Natural Gas for Model YAC1840YACX501K — EF680015

This is the factory OEM replacement gas valve for the Carrier YAC1840YACX501K packaged unit. The combination gas valve is the heart of the heating system's fuel delivery — it receives the 24V signal from the control board, opens to allow natural gas flow to the burners, and closes immediately if ignition fails or a safety fault is detected. When this valve fails, symptoms typically include a complete no-heat condition, a furnace that attempts ignition but never fires, or a system that locks out after one or more failed ignition trials.

• Specs: 24 VAC coil voltage | Single-stage operation | 1/2" inlet/outlet | Natural gas rated | Hot surface ignition (HSI) / direct spark ignition (DSI) compatible | Factory part number EF680015
• OEM vs Generic: This is a genuine Carrier OEM valve, manufactured to exact factory pressure and flow specifications. Aftermarket valves often fail pressure-regulation tolerances, risking improper gas delivery, nuisance lockouts, or unsafe operation — always choose OEM on gas-carrying components.
• Install difficulty: 4/5 — Gas valve replacement must be performed by a licensed HVAC technician or qualified professional. Required tools include a manometer, pipe wrench, gas leak detector solution, and a multimeter to verify coil resistance (typically 40–60 Ω). Always shut off the gas supply upstream and verify zero pressure before disconnecting the old valve.
• Warranty: 1-year OEM factory warranty against defects in materials and workmanship. Orders placed before 3:00 PM local time ship same business day from our warehouse.

Compatibility: Engineered specifically for the Carrier YAC1840YACX501K packaged unit. Verify your unit's data plate confirms natural gas fuel type and 24VAC control voltage before ordering. If you have any questions about fitment, our HVAC parts specialists are available to confirm compatibility before your order ships — same-day shipping available on all in-stock OEM parts.