Lochinvar & A.O. Smith 100327001 Flame Sensor Kit

The Lochinvar & A.O. Smith 100327001 Flame Sensor Kit is the verified OEM replacement flame sensor engineered for high-efficiency water heaters and boilers. Designed as the direct successor to legacy part numbers PLT1150 and 100165859, this kit is critical for maintaining the flame rectification process within the combustion chamber. As a seasoned technician, you know that a degraded HVAC flame rod is the primary culprit behind intermittent ignition failure and nuisance 3-flash lockouts. This kit includes the precision-engineered sensor and the necessary flame sensor gasket to ensure a gas-tight seal upon installation. By accurately monitoring the DC microamp (µA) signal—typically requiring a minimum of 1.0 µA to prove flame—this furnace flame sensor prevents hazardous gas buildup. Utilizing genuine Lochinvar components ensures seamless control board compatibility and prevents the impedance issues often associated with generic aftermarket rods. Whether you are performing routine maintenance or a 2:00 AM emergency repair, this 100327001 sensor kit provides the reliable millivolt feedback necessary for stable burner operation.

Key Benefits

• Direct OEM Compatibility: Engineered specifically to replace Lochinvar PLT1150 and A.O. Smith 100165859 without bracket modifications.
• High-Temperature Durability: The specialized ceramic insulator and high-grade metal rod withstand extreme thermal cycling within the burner assembly.
• Reduced Lockout Intervals: Re-establishes a strong flame rectification signal, eliminating "short cycling" and limit switch trips caused by poor flame sensing.
• Comprehensive Kit: Includes the essential mounting gasket to maintain atmospheric integrity and prevent combustion leaks.
• Enhanced Safety: Critical for the gas valve lockout sequence, ensuring the system shuts down immediately if a flame is not detected.

Common Questions

How do I know if the 100327001 is failing?
If the burner ignites but shuts off after 2-5 seconds, or if the control board displays an ignition failure code despite a visible flame, the sensor likely has carbon buildup or a cracked ceramic insulator. Always check for a minimum 1.0 microamp signal before replacing.

Can I clean this sensor instead of replacing it?
While cleaning with fine steel wool may temporarily restore a signal, the protective coating on OEM flame sensors eventually wears thin. For long-term reliability and to prevent repeat service calls, a full flame sensor replacement is recommended.

Is the gasket included in the 100327001 kit?
Yes, this kit includes the Lochinvar flame sensor gasket, which should always be replaced during the swap to ensure a proper seal against the burner plate.

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.