Ensure the PTFE glass seals are properly seated and avoid over-tightening

making it a critical replacement HVAC sensor for maintaining setpoint accuracy

Durability: Built to handle the high-cycle demands of modern hydronic heating systems without degrading performance

such as a cracked heat exchanger or restricted airflow

verify the run capacitor specifications to ensure the system starts under load efficiently

Fenwal 35-630500-007 Module 321702-401 Ensure the PTFE glass sealsThe Fenwal 35 630500 007 Ignition Module is a high performance 24 VAC intermittent pilot ignition control engineered for precision in gas fired furnaces, boilers, and unit heaters. This microprocessor based module replaces legacy analog systems, utilizing DETECT A FLAME technology for reliable flame rectification and safe start up. Operating with a 90 second Trial for Ignition (TFI) and 0 second pre purge, it ensures immediate response upon a call for