a "humming" motor that fails to start

000 BTU/hr to support large commercial boilers and water heating systems

which is vital for maintaining system efficiency and compressor health

maintaining the necessary manifold pressure for optimal BTU output

While it may fit standard ignitor dimensions

Reznor 43594 Flame Sensor 318973-401 a "humming" motor that failsThe Reznor 43594 Flame Sensor is a critical safety component designed for precise flame rectification in high performance heating equipment. As an authentic OEM Reznor part, it ensures the ignition module receives a consistent microamp signal (typically between 3 to 10 A), preventing the short cycling or lockout issues common with worn or carbon fouled sensors. Engineered to withstand the intense thermal stress of gas fired unit heaters, this sensor