What causes these coils to hum or buzz

Rollout switches typically require a manual reset for safety

ensuring exact L270-20F temperature calibration

It functions as a millivolt generator

Lochinvar & A.O. Smith 100110740 Temperature Control 323080-701 What causes these coils toThe Lochinvar & A. O. Smith 100110740 Temperature Control is a critical OEM replacement part designed for high precision thermal regulation in commercial and residential hydronic systems. Engineered for seamless integration with Lochinvar boilers and A. O. Smith water heaters, this immersion temperature control features a 1 2" NPT brass well connection, ensuring a robust seal and accurate sensing within the heat exchanger or storage tank. It operates