Lochinvar & A.O. Smith 100330200 Flame Sensor 320788-703 This 1/4" NPT temperature sensor

This 1/4" NPT temperature sensor provides high-accuracy thermal feedback to the control board

allowing technicians to verify travel and set limits quickly

HSI) and does not support standing pilot thermocouples

Most failures are caused by improper leveling during installation

and includes an adjustable minimum position stop to prevent total airflow cutoff where required

Lochinvar & A.O. Smith 100330200 Flame Sensor 320788-703 This 1/4" NPT temperature sensorThe Lochinvar & A. O. Smith 100330200 Flame Sensor is a critical OEM replacement part designed for high efficiency commercial boilers and water heaters. Engineered for precise flame detection, this sensor monitors the burner's ionization current to ensure safe and continuous burner operation. A failing sensor often manifests as a short cycling burner or a hard lockout with flame loss error codes. This 100330200 flame rod comes as a complete assembly,