Lochinvar & A.O. Smith 100093870 Door Assembly 321702-401 The Siemens S55155-A108 Actuator is

The Siemens S55155-A108 Actuator is the reliable professional-grade choice for terminal unit applications where fail-in-place functionality is a system requirement

preventing the control board from sending voltage to the gas valve

allowing technicians to clear captured debris during routine maintenance cycles to maintain optimal GPM flow rates

ensuring consistent heating and cooling delivery

Common Questions: Is this burner compatible with my specific furnace model

Lochinvar & A.O. Smith 100093870 Door Assembly 321702-401 The Siemens S55155-A108 Actuator isThe Lochinvar & A. O. Smith 100093870 Door Assembly is a critical replacement manifold door assembly designed for residential gas water heaters featuring the flammable vapor ignition resistant (FVIR) system. This genuine OEM component maintains the combustion chamber seal, ensuring the pilot assembly and burner tube interface correctly with the burner chamber to prevent backdrafting and inefficient combustion. Built for high heat resilience, the