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This is the genuine OEM straight flame sensor for the Carrier PG9MAA048060AAKA gas furnace, sold under OEM part number LH680013. The flame sensor is a small but critical safety component — a metal rod that sits in the burner flame and passes a micro-amp current through the flame to prove combustion. When it works correctly, the control board receives confirmation that the burner is lit and continues the heating cycle. When the sensor rod becomes oxidized, coated with residue, or fails entirely, the board can no longer detect the flame signal and shuts off the gas valve within 5–8 seconds as a safety measure, causing the furnace to lock out or repeatedly short-cycle without heating your home.
Compatibility: Designed for the Carrier PG9MAA048060AAKA gas furnace. Also cross-references part numbers LH33WZ516 and LH33WZ514. Always verify your existing part number on the sensor bracket or your furnace's service manual before ordering. Have questions about fitment? Our HVAC parts specialists confirm compatibility before you buy — reach out via chat or phone.