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Supco SPLT3400 Hot Surface Ignitor 321702 401 a compromised furnace collector box a compromised furnace collector box often leads to intermittent pressure switch trips or "stuck open" fault codes due to restricted airflow or blocked sensing ports Direct Technical Fit: Designed as a direct replacement for ASCO part number 216758 041 D High Thermal Stability: Maintains consistent resistance levels over its service life The Supco SPLT3400 Hot Surface Ignitor is a high performance silicon nitride heating element designed to provide reliable ignition in forced air furnaces and boilers
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