or a humming sound indicating a bad HVAC capacitor or seized bearings

Proven Reliability: The ZR48K5E frame is a field-tested standard for commercial HVAC systems

Key Benefits Universal Compatibility: Engineered as a direct replacement for Barber Colman AL-87 and M-215 components

preventing carbon tracking and premature failure of the ignition system

Lochinvar & A.O. Smith 100173747 Control 318423-701 or a humming sound indicatingThe Lochinvar & A. O. Smith 100173747 Control is a critical safety component designed for high performance hydronic systems and commercial water heaters. This low water cut off with manual reset (LWCO) serves as a fail safe mechanism, monitoring internal water levels to prevent dry firing. Engineered specifically for Lochinvar boiler systems and A. O. Smith commercial units, the 100173747 ensures the burner circuit is interrupted immediately if a low