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Common Questions Is the 42J04 compatible with my older 42J0401 switch
Enhanced Corrosion Resistance: Built to handle the high-acidity environments of the condensing process better than original factory-installed baseline units
The 3/8 x 1/2 SW TXV configuration is designed for direct compatibility with standard liquid and suction line sizes
The Fenwal 35-704600-001 is a microprocessor-based 120V Direct Spark Ignition (DSI) control engineered for high-performance gas-fired equipment
Lochinvar & A.O. Smith 100109908 Flame Sensor 320788-702 Common Questions Is the 42J04The Lochinvar & A. O. Smith 100109908 Flame Sensor is a critical OEM replacement part designed for precise flame rectification in high efficiency water heaters and boilers. As a seasoned tech, you know that a failing flame sensor rod is the primary culprit behind intermittent data signals and "no flame detected" lockouts. This genuine factory part (formerly identified as part number 9004520215) ensures the flame sensing circuit maintains the microamp
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