While it monitors the flame via rectification

A faulty switch typically triggers a specific diagnostic flash code on the furnace control board

System Reliability: Eliminates false "Code 4" low-water temperature faults caused by drifted or out-of-calibration legacy sensors

To facilitate a professional installation and maintain the integrity of the combustion chamber

What is the direct replacement for the obsolete R40E289M

Johnson Controls VG7241LT+72CHGA Valve Assembly Els PW 17895 While it monitors the flameThe Johnson Controls VG7241LT+72CHGA is a heavy duty 2 way normally open control valve assembly engineered for precise flow modulation in commercial hydronic systems. Featuring a 3 4 inch NPT connection and a 7. 3 Cv rating, this unit utilizes an equal percentage flow characteristic to ensure stable thermal control across varying load conditions. The valve body is constructed from high grade cast bronze with a durable brass trim, providing the