Supco FLS700 Flame Sensor for LP/NG Gas Furnaces

The Supco FLS700 is a replacement flame sensor designed for LP (liquid propane) and natural gas furnaces. This critical safety component monitors the presence of flame in the burner assembly and signals the control board to keep the gas valve open during operation.

Key Features:

• Direct replacement for manufacturer part number 25-27773-700
• Compatible with both LP and natural gas applications
• Constructed with heat-resistant ceramic insulator and stainless steel flame rod
• Ensures safe furnace operation by detecting flame presence
• Prevents gas flow when no flame is detected

Flame sensors are essential safety devices that prevent dangerous gas buildup by shutting off the gas valve if the burner flame goes out. The FLS700 provides reliable flame detection to keep your heating system operating safely and efficiently. Regular replacement of worn flame sensors helps prevent furnace lockouts and ensures proper system operation.