Precise Calibration: Factory-calibrated for immediate installation

For safety and equipment longevity

burner box tops

Replacing a failed 100110973 switch is essential when troubleshooting persistent blocked flue fault codes or proving issues where the blower is operational but the ignition sequence is interrupted

Lochinvar & A.O. Smith 100173794 Door Kit Refrigerant Precise Calibration: Factory-calibrated for immediateWhen you're servicing high efficiency units like the Lochinvar Knight XL or A. O. Smith commercial boilers, maintaining the integrity of the combustion chamber is non negotiable. The Lochinvar & A. O. Smith 100173794 Door Kit is the specific OEM replacement part required to ensure a gas tight seal on the heat exchanger access point. Designed for precision fitment on models including the KBN399 and KBN500, this heat exchanger access door kit allows for