Lochinvar & A.O. Smith 100093923 Assembly 320788-702 debris in the seat or

debris in the seat or a burnt-out solenoid coil are the most common points of failure for field technicians

This specific model features a 60-inch capillary for versatile mounting and a start voltage set at 40% of the supply voltage to ensure reliable motor torque upon startup

it serves as the primary safeguard against inadequate venting or combustion air blockages

For systems with auxiliary or emergency heat strips

While a failed 100208401 switch is a common culprit

Lochinvar & A.O. Smith 100093923 Assembly 320788-702 debris in the seat orThe Lochinvar & A. O. Smith 100093923 Assembly is a precise MFG40 NAT Manifold Door Assy engineered for natural gas water heaters. As a veteran grade OEM replacement part, this assembly ensures a critical airtight seal for the combustion chamber, maintaining the high efficiency performance required in standard and commercial heating applications. Built to withstand the thermal stress of constant cycling, the manifold door assembly integrates a heavy