Use the integrated test button on the face of the control

unstable flame signals during low-fire modulation

offering a compact footprint for tight installations where reliable liquid injection is critical for compressor protection and heat exchange efficiency

loss of airflow

Lochinvar & A.O. Smith 100112614 Controller 319852-301 Use the integrated test buttonThe Lochinvar & A. O. Smith 100112614 Combined Controller is the primary electronic control board managing combustion, temperature regulation, and safety protocols for BTH 400A Series 104 commercial water heaters. As a critical OEM replacement part, this integrated controller replaces legacy part number 9008219005, ensuring seamless BTH 400 104 compatibility. Designed specifically for natural gas water heaters, it monitors internal flow, pressure, and