Lochinvar & A.O. Smith 100109841 Gas Valve 30067439-890 buzzing is typically caused by

buzzing is typically caused by low voltage to the coil or debris trapped between the plunger and the tube head

Techs should ensure the thermostat probe is fully immersed in the top 6 inches of the tank water to function correctly

For bidirectional requirements

the Erie VS series is the appropriate technical choice

What does a flashing LED or lockout indicate

Lochinvar & A.O. Smith 100109841 Gas Valve 30067439-890 buzzing is typically caused byThe Lochinvar & A. O. Smith 100109841 Gas Valve is a direct replacement component engineered for high efficiency commercial and residential water heating systems. This replacement gas valve operates on a 24V signal and is factory calibrated for Natural Gas applications with a 3. 5" W. C. manifold pressure setting. Featuring 1 2" NPT inlet and outlet ports, this Robertshaw gas valve assembly ensures precise fuel metering and reliable ignition cycles