Description
The Lochinvar & A.O. Smith 100165921 is an OEM replacement flame sensor engineered to deliver accurate, dependable flame detection in compatible water heaters and boilers. Flame sensors play a critical role in your heating system’s safety circuit — they confirm the presence of a burner flame and signal the control board to maintain or shut off gas flow, protecting against unburned fuel accumulation and unsafe operating conditions.
Why Replace Your Flame Sensor?
A worn or fouled flame sensor can cause nuisance lockouts, intermittent ignition failures, or prevent your system from firing altogether. Using a genuine OEM part like the 100165921 ensures proper electrical signal output and a precise fit, restoring your equipment to factory performance without the guesswork of aftermarket substitutes.
Key Features
- OEM replacement flame sensor for Lochinvar and A.O. Smith equipment
- Engineered for accurate flame rectification signal output
- Direct drop-in replacement — no modifications required
- Helps prevent nuisance lockouts and unsafe burner conditions
- Manufactured to original equipment specifications for reliable long-term performance
Compatible Applications
- Designed for use with select Lochinvar and A.O. Smith water heaters and boilers
- Consult your equipment manual or service documentation to confirm compatibility with your specific model
Installation Notes
Always de-energize the appliance before servicing. Clean the sensor rod of any oxidation buildup during installation. Verify proper microamp signal output after replacement using a multimeter to confirm correct operation.
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