Reznor 222771 Flame Sensor for Gas Furnaces and Unit Heaters

The Reznor 222771 is a genuine OEM flame sensor designed for use with Reznor gas furnaces and unit heaters. This critical safety component monitors the burner flame during operation to ensure proper combustion and safe heating performance.

Key Features:

• Genuine OEM Reznor replacement part for guaranteed compatibility
• Monitors flame presence during burner operation
• Automatically shuts off gas valve if flame is not detected
• Essential safety component that prevents unburned gas buildup
• Direct replacement for worn or failed flame sensors

Flame sensors work by detecting the electrical current produced by the flame itself. When the burner ignites, the sensor confirms proper combustion and allows the gas valve to remain open. If combustion is disrupted or the flame goes out, the sensor immediately signals the control system to shut off the gas supply, preventing dangerous gas accumulation. Regular inspection and replacement of flame sensors ensures reliable heating operation and maintains critical safety protection.