OEM Carrier Flame Sensor Replacement for PG95SAS42100CBAA Furnace

The flame sensor (flame rectification rod) in your Carrier PG95SAS42100CBAA confirms that the burners actually ignited after the hot surface igniter fires. It sits directly in the burner flame and passes a tiny microamp current to ground, telling the control board it is safe to keep the gas valve open. When the rod oxidizes, carbons over, or cracks, that signal drops below the board's threshold and the gas valve is shut within seconds as a safety response. The classic homeowner symptom is short-cycling: the furnace lights for 3-7 seconds, the flame drops out, the blower pushes cold air, and the sequence repeats two or three times before the board locks out for an hour. You may also see a 'flame not sensed' LED fault code and feel only lukewarm or cold air at the registers. This is a single-rod flame rectification sensor with a ceramic insulator and a Kanthal/stainless sensing rod rated for continuous burner-flame exposure above 1,800°F. A healthy sensor reads open to ground and produces a flame signal of roughly 1-6 microamps DC when immersed in flame; readings below about 0.7 µA trigger lockout. It mounts with a single screw and terminates in a 1/4" male spade. A genuine OEM sensor uses the correct rod alloy and insulator length so the flame fully envelops the rod and the microamp signal stays stable. Generic rods often use thinner plating that oxidizes faster and shorter rods that read a weak, intermittent signal — causing nuisance lockouts months after install. Install difficulty: 1/5. Tools: 1/4" nut driver, fine emery cloth or steel wool, and a microamp-capable multimeter. SAFETY: turn off both the gas supply and the furnace power at the breaker before removing the sensor. 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 PG95SAS42100CBAA. 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.