OEM Carrier Hot Surface Igniter for PY4GNAB42090NA Gas Furnace

The hot surface igniter lights the gas as it enters the burner assembly of your PY4GNAB42090NA furnace. On each call for heat, the control board sends 120V to the igniter, which glows orange-hot and ignites the burners. When the igniter weakens or cracks, the hallmark symptom is a furnace that tries to start but never produces heat — the inducer motor spins up and the gas valve clicks, but the burners never light. Many homeowners notice short-cycling, a furnace that locks out after three failed attempts, or a cold house while the thermostat keeps calling for heat. A cracked element, or one that glows dull red instead of bright orange, is failing. Specs: Genuine OEM silicon nitride hot surface igniter rated for 120VAC with a typical cold resistance of about 40–75 ohms. Silicon nitride is more durable and thermal-shock resistant than older silicon carbide, surviving thousands of ignition cycles without the brittle cracking carbide units are prone to. OEM vs Generic: Igniter resistance is critical. A generic igniter with the wrong resistance draws the wrong current — too high and it never glows hot enough to light gas reliably; too low and it burns out early. OEM igniters are matched to your furnace's ignition-control timing for consistent light-off and full element life. Install: Difficulty 2 of 5. Tools: 1/4" nut driver and clean gloves. SAFETY: Turn off both the gas supply and the furnace breaker before servicing. Never touch the ceramic element with bare fingers — skin oils create hot spots that crack the igniter. Ships same business day from our stocked warehouse on orders placed before 3 PM CST. Backed by a 1-year OEM warranty and 30-day hassle-free returns on uninstalled parts.

Compatibility

This part is compatible with Carrier model PY4GNAB42090NA. Always verify the part number against your unit's data plate before ordering.

Why Choose OEM?

OEM parts are manufactured to the exact factory specifications for your unit. Generic aftermarket alternatives may fit physically but often use lower-rated components that reduce equipment life and void manufacturer warranties. When the cost difference between OEM and generic is $10-30, the OEM part is always the smarter investment on a system worth $5,000-$15,000.

Shipping & Returns

Same-day shipping on orders before 3 PM CST. Standard delivery 2-5 business days, express options available at checkout. 30-day hassle-free returns on uninstalled parts — free return shipping included. 1-year OEM factory warranty coverage.