OEM Carrier Flame Sensor Replacement for PG95SAS42100CAAA Furnace

The flame sensor in your Carrier PG95SAS42100CAAA is a flame rectification rod that verifies the burners actually lit after the igniter fires. Seated in the burner flame, it passes a small microamp current to ground; the control board reads that current as proof of flame and keeps the gas valve open. As the rod oxidizes or develops a silica/carbon coating over a few heating seasons, the signal weakens until it falls below the board's threshold, and the gas valve closes within seconds for safety. The hallmark symptom is short-cycling: the furnace ignites for several seconds, the flame drops out, the blower delivers cold air, and the cycle repeats until the board locks out. You'll often see a 'flame not sensed' or 'flame lost' status code and inconsistent, cool airflow. This is a single-rod flame rectification sensor with a ceramic insulator and a high-temperature sensing rod rated for continuous flame exposure above 1,800°F. Bench-tested it reads open to ground; in service it should generate roughly 1-6 microamps DC of flame signal, with anything under about 0.7 µA causing dropout. It uses a single-screw mount and a 1/4" male spade terminal. A true OEM sensor uses the correct rod alloy, length, and insulator so the flame fully surrounds the rod and the microamp reading stays steady. Generic rods often plate thinner and oxidize quickly or sit too short in the flame, producing a weak, drifting signal and nuisance lockouts soon after install. Install difficulty: 1/5. Tools: 1/4" nut driver, fine emery cloth or steel wool, and a microamp-capable multimeter. SAFETY: shut off the gas supply and the furnace 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 PG95SAS42100CAAA. 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.