OEM Carrier Flame Sensor LH33WZ for PG9MAA048100ACKA

The flame sensor is the safety device that confirms your Carrier PG9MAA burners actually lit. After ignition, the control board sends a small AC voltage down the sensor rod; the flame conducts a tiny microamp DC current back through the flame's ions (flame rectification). If the board doesn't see that current within a few seconds, it closes the gas valve to prevent raw gas from flooding the heat exchanger. When the sensor gets coated with oxidation or silica, that signal drops and the furnace short-cycles: burners light for 3–7 seconds, then shut off, often repeating several times before locking out and leaving you with no heat. This is a single-rod sensing electrode with a high-temperature ceramic insulator and the spade or ring terminal matched to the 9MAA harness. A healthy sensor should read a flame current of roughly 2–6 microamps DC; anything below about 1.0 µA will cause dropouts. The Kanthal rod is designed to survive direct flame impingement without warping out of the flame envelope. Why OEM: the sensing rod's length, bend angle, and mounting position are engineered so the tip sits in the hottest, most ionized part of the flame. Generic sensors often have slightly different rod geometry or lower-grade insulators that crack and leak current to ground — producing exactly the intermittent lockouts you're trying to fix. Installation difficulty: 1/5. Tools: 1/4" nut driver and fine emery cloth or a Scotch-Brite pad. #1 safety warning: turn off the gas at the unit shutoff and kill power at the breaker before reaching into the burner compartment. Never sand a sensor with sandpaper grit that leaves residue — use light abrasive only. 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 PG9MAA048100ACKA. 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.