Weil McLain 511-724-274 Flame Sensor

The Weil McLain 511-724-274 Main Flame Sensor is a critical OEM replacement part engineered for precise flame rectification in high-efficiency boiler systems. As a veteran technician knows, a fouled or oxidized HVAC flame sensor is the primary culprit behind intermittent ignition failure and short-cycling. This genuine Weil McLain replacement part is designed to withstand high combustion temperatures, providing a reliable microamp signal to the boiler control module to ensure the gas valve remains safely energized during the heating cycle.

Constructed with high-grade alumina ceramic insulation and a durable Kanthal sensing rod, the Weil McLain 511-724-274 ensures 100% compatibility with specific Weil McLain CGi, EGH, and LGB series boilers. When troubleshooting a boiler not firing, replacing the flame rod is often more effective than repeated cleaning, which can strip the protective coating and lead to rapid re-sooting. This boiler flame sensor provides the exact physical dimensions and offset required for proper alignment within the burner assembly, preventing nuisance lockouts and ensuring optimal furnace troubleshooting outcomes for commercial and residential accounts.

• OEM Precision: Direct replacement for part number 511-724-274, ensuring exact fitment and voltage signaling without field modifications.
• Enhanced Conductivity: Optimized rod material provides stable microamp readings to the ignition control, even in high-demand cycles.
• System Safety: Prevents raw gas discharge by accurately proving the main burner flame within milliseconds of ignition.
• Durability: High-temperature ceramic housing resists cracking and electrical leakage under extreme thermal stress.

Is this sensor compatible with all Weil McLain boilers?
This specific sensor is designed for the CGi, EGH, PFG, and LGB series. Always verify against your specific boiler model number and gas valve configuration before installation.

What are the signs that my Weil McLain flame sensor is failing?
The most common symptoms include the boiler lighting for a few seconds and then shutting down, or the control module displaying an "Ignition Lockout" or "Flame Not Sensed" error code.

Can I clean the 511-724-274 instead of replacing it?
While light cleaning with a fine abrasive pad can provide a temporary fix, recurring oxidation often requires a full replacement to restore system reliability and prevent short cycling.

Disclaimer: While we strive for 100% accuracy, product data and specifications are subject to change. Please contact our team to confirm compatibility or technical details before purchasing.