Lochinvar & A.O. Smith 100111041 Controller 321042-401 this is an upper thermostat

this is an upper thermostat specifically

the logic board kit may be compromised

while its compact size and lightweight design allow for seamless integration onto 1/4-inch SAE female flare fittings without additional brackets

Technicians often look for symptoms like a blower motor that runs constantly

or compressed air circuits

Lochinvar & A.O. Smith 100111041 Controller 321042-401 this is an upper thermostatThe Lochinvar & A. O. Smith 100111041 Combined Controller is the critical OEM replacement for BTH 250 100 high efficiency commercial water heaters. As a veteran grade HVAC control board, this unit integrates ignition control, temperature regulation, and diagnostic functions into a single combined controller module. It serves as a direct, high performance successor to obsolete part number 9006265005. Designed for demanding commercial environments, this