Furnace Flame Sensor, 2.5" Flange to Tip, FLS51M14

Furnace Flame Sensor | FLS51M14 | 2.5" Flange-to-Tip | 1/4" Quick Disconnect

Restore reliable furnace ignition and flame detection with this brand-new FLS51M14 flame sensor. Designed for accurate flame monitoring, this sensor helps prevent ignition failure, short cycling, and furnace lockout by ensuring the control board receives proper flame‑presence feedback.

Features & Benefits:

• OEM‑style flame sensor for gas furnaces
• 2.5" flange-to-tip length for proper burner alignment
• 1/4" quick-disconnect terminal for easy installation
• Durable stainless-steel rod for long service life
• Direct-fit replacement for multiple OEM part numbers
• Condition: Brand New – Unused

Replaces Part Numbers:

51M14, 43K88, PSE-L58-SB
Direct replacement for OEM-style flame sensors.

✅ Fits Models:

Model list not provided — fits many gas furnaces using 51M14-style flame sensors.
Please verify your part number before ordering.

Common Fixes:

• ❌ Furnace starts then shuts down after a few seconds
• ⚠️ Ignition failure or intermittent heating
• Flame not being detected by the control board
• Replacing a dirty, corroded, or worn flame sensor

️ Installation Tips:

• Turn off furnace power before servicing
• Locate sensor near the burner assembly
• Clean mounting area and ensure proper alignment
• Connect using the 1/4" quick-disconnect terminal
• Test ignition cycle after installation to confirm proper flame detection

Reliable flame detection. Smooth ignition. OEM‑fit performance for gas furnaces using 51M14‑style sensors.